diff --git a/Cargo.lock b/Cargo.lock
index 2bc8f33..5aea1c2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,6 +2,21 @@
 # It is not intended for manual editing.
 version = 4
 
+[[package]]
+name = "Inflector"
+version = "0.11.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fe438c63458706e03479442743baae6c88256498e6431708f6dfc520a26515d3"
+
+[[package]]
+name = "addr"
+version = "0.15.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a93b8a41dbe230ad5087cc721f8d41611de654542180586b315d9f4cf6b72bef"
+dependencies = [
+ "psl-types",
+]
+
 [[package]]
 name = "adler2"
 version = "2.0.1"
@@ -15,7 +30,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d122413f284cf2d62fb1b7db97e02edb8cda96d769b16e443a4f6195e35662b0"
 dependencies = [
  "crypto-common",
- "generic-array",
+ "generic-array 0.14.7",
 ]
 
 [[package]]
@@ -44,6 +59,29 @@ dependencies = [
  "subtle",
 ]
 
+[[package]]
+name = "affinitypool"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2dde2a385b82232b559baeec740c37809051c596f9b56e7da0d0da2c8e8f54f6"
+dependencies = [
+ "async-channel 2.5.0",
+ "num_cpus",
+ "thiserror 1.0.69",
+ "tokio",
+]
+
+[[package]]
+name = "ahash"
+version = "0.7.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "891477e0c6a8957309ee5c45a6368af3ae14bb510732d2684ffa19af310920f9"
+dependencies = [
+ "getrandom 0.2.17",
+ "once_cell",
+ "version_check",
+]
+
 [[package]]
 name = "ahash"
 version = "0.8.12"
@@ -52,6 +90,7 @@ checksum = "5a15f179cd60c4584b8a8c596927aadc462e27f2ca70c04e0071964a73ba7a75"
 dependencies = [
  "cfg-if",
  "const-random",
+ "getrandom 0.3.4",
  "once_cell",
  "version_check",
  "zerocopy",
@@ -72,7 +111,7 @@ version = "0.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ee4508988c62edf04abd8d92897fca0c2995d907ce1dfeaf369dac3716a40685"
 dependencies = [
- "as-slice",
+ "as-slice 0.2.1",
 ]
 
 [[package]]
@@ -84,6 +123,34 @@ dependencies = [
  "equator",
 ]
 
+[[package]]
+name = "allocator-api2"
+version = "0.2.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "683d7910e743518b0e34f1186f92494becacb047c7b6bf616c96772180fef923"
+
+[[package]]
+name = "ammonia"
+version = "4.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "17e913097e1a2124b46746c980134e8c954bc17a6a59bb3fde96f088d126dde6"
+dependencies = [
+ "cssparser",
+ "html5ever",
+ "maplit",
+ "tendril",
+ "url",
+]
+
+[[package]]
+name = "android_system_properties"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "819e7219dbd41043ac279b19830f2efc897156490d7fd6ea916720117ee66311"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "anstream"
 version = "1.0.0"
@@ -134,12 +201,36 @@ dependencies = [
  "windows-sys 0.61.2",
 ]
 
+[[package]]
+name = "any_ascii"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "90c6333e01ba7235575b6ab53e5af10f1c327927fd97c36462917e289557ea64"
+
 [[package]]
 name = "anyhow"
 version = "1.0.102"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7f202df86484c868dbad7eaa557ef785d5c66295e41b460ef922eca0723b842c"
 
+[[package]]
+name = "approx"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f2a05fd1bd10b2527e20a2cd32d8873d115b8b39fe219ee25f42a8aca6ba278"
+dependencies = [
+ "num-traits",
+]
+
+[[package]]
+name = "approx"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cab112f0a86d568ea0e627cc1d6be74a1e9cd55214684db5561995f6dad897c6"
+dependencies = [
+ "num-traits",
+]
+
 [[package]]
 name = "ar_archive_writer"
 version = "0.5.1"
@@ -196,6 +287,18 @@ version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "175571dd1d178ced59193a6fc02dde1b972eb0bc56c892cde9beeceac5bf0f6b"
 
+[[package]]
+name = "as-slice"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "45403b49e3954a4b8428a0ac21a4b7afadccf92bfd96273f1a58cd4812496ae0"
+dependencies = [
+ "generic-array 0.12.4",
+ "generic-array 0.13.3",
+ "generic-array 0.14.7",
+ "stable_deref_trait",
+]
+
 [[package]]
 name = "as-slice"
 version = "0.2.1"
@@ -205,6 +308,15 @@ dependencies = [
  "stable_deref_trait",
 ]
 
+[[package]]
+name = "ascii-canvas"
+version = "3.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8824ecca2e851cec16968d54a01dd372ef8f95b244fb84b84e70128be347c3c6"
+dependencies = [
+ "term",
+]
+
 [[package]]
 name = "ash"
 version = "0.38.0+1.3.281"
@@ -390,6 +502,77 @@ dependencies = [
  "once_cell",
 ]
 
+[[package]]
+name = "async-graphql"
+version = "7.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1057a9f7ccf2404d94571dec3451ade1cb524790df6f1ada0d19c2a49f6b0f40"
+dependencies = [
+ "async-graphql-derive",
+ "async-graphql-parser",
+ "async-graphql-value",
+ "async-io",
+ "async-trait",
+ "asynk-strim",
+ "base64 0.22.1",
+ "bytes",
+ "fnv",
+ "futures-util",
+ "http",
+ "indexmap 2.14.0",
+ "mime",
+ "multer",
+ "num-traits",
+ "pin-project-lite",
+ "regex",
+ "serde",
+ "serde_json",
+ "serde_urlencoded",
+ "static_assertions_next",
+ "thiserror 2.0.18",
+]
+
+[[package]]
+name = "async-graphql-derive"
+version = "7.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2e6cbeadc8515e66450fba0985ce722192e28443697799988265d86304d7cc68"
+dependencies = [
+ "Inflector",
+ "async-graphql-parser",
+ "darling",
+ "proc-macro-crate",
+ "proc-macro2",
+ "quote",
+ "strum 0.27.2",
+ "syn 2.0.117",
+ "thiserror 2.0.18",
+]
+
+[[package]]
+name = "async-graphql-parser"
+version = "7.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e64ef70f77a1c689111e52076da1cd18f91834bcb847de0a9171f83624b07fbf"
+dependencies = [
+ "async-graphql-value",
+ "pest",
+ "serde",
+ "serde_json",
+]
+
+[[package]]
+name = "async-graphql-value"
+version = "7.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3e3ef112905abea9dea592fc868a6873b10ebd3f983e83308f995d6284e9ba41"
+dependencies = [
+ "bytes",
+ "indexmap 2.14.0",
+ "serde",
+ "serde_json",
+]
+
 [[package]]
 name = "async-io"
 version = "2.6.0"
@@ -521,6 +704,17 @@ dependencies = [
  "syn 2.0.117",
 ]
 
+[[package]]
+name = "async_io_stream"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b6d7b9decdf35d8908a7e3ef02f64c5e9b1695e230154c0e8de3969142d9b94c"
+dependencies = [
+ "futures",
+ "pharos",
+ "rustc_version",
+]
+
 [[package]]
 name = "async_zip"
 version = "0.0.17"
@@ -547,6 +741,16 @@ dependencies = [
  "pin-project-lite",
 ]
 
+[[package]]
+name = "asynk-strim"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "52697735bdaac441a29391a9e97102c74c6ef0f9b60a40cf109b1b404e29d2f6"
+dependencies = [
+ "futures-core",
+ "pin-project-lite",
+]
+
 [[package]]
 name = "atomic"
 version = "0.5.3"
@@ -574,7 +778,7 @@ version = "0.30.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "16e2cdb6d5ed835199484bb92bb8b3edd526effe995c61732580439c1a67e2e9"
 dependencies = [
- "base64",
+ "base64 0.22.1",
  "http",
  "log",
  "url",
@@ -645,6 +849,12 @@ dependencies = [
  "match-lookup",
 ]
 
+[[package]]
+name = "base64"
+version = "0.21.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9d297deb1925b89f2ccc13d7635fa0714f12c87adce1c75356b39ca9b7178567"
+
 [[package]]
 name = "base64"
 version = "0.22.1"
@@ -657,6 +867,19 @@ version = "1.8.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2af50177e190e07a26ab74f8b1efbfe2ef87da2116221318cb1c2e82baf7de06"
 
+[[package]]
+name = "bcrypt"
+version = "0.15.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e65938ed058ef47d92cf8b346cc76ef48984572ade631927e9937b5ffc7662c7"
+dependencies = [
+ "base64 0.22.1",
+ "blowfish",
+ "getrandom 0.2.17",
+ "subtle",
+ "zeroize",
+]
+
 [[package]]
 name = "bincode"
 version = "1.3.3"
@@ -686,15 +909,30 @@ dependencies = [
  "syn 2.0.117",
 ]
 
+[[package]]
+name = "bit-set"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0700ddab506f33b20a03b13996eccd309a48e5ff77d0d95926aa0210fb4e95f1"
+dependencies = [
+ "bit-vec 0.6.3",
+]
+
 [[package]]
 name = "bit-set"
 version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "08807e080ed7f9d5433fa9b275196cfc35414f66a0c79d864dc51a0d825231a3"
 dependencies = [
- "bit-vec",
+ "bit-vec 0.8.0",
 ]
 
+[[package]]
+name = "bit-vec"
+version = "0.6.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "349f9b6a179ed607305526ca489b34ad0a41aed5f7980fa90eb03160b69598fb"
+
 [[package]]
 name = "bit-vec"
 version = "0.8.0"
@@ -728,6 +966,18 @@ dependencies = [
  "no_std_io2",
 ]
 
+[[package]]
+name = "bitvec"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1bc2832c24239b0141d5674bb9174f9d68a8b5b3f2753311927c172ca46f7e9c"
+dependencies = [
+ "funty",
+ "radium",
+ "tap",
+ "wyz",
+]
+
 [[package]]
 name = "blade-graphics"
 version = "0.7.1"
@@ -821,7 +1071,7 @@ version = "0.10.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3078c7629b62d3f0439517fa394996acacc5cbc91c5a20d8c658e77abd503a71"
 dependencies = [
- "generic-array",
+ "generic-array 0.14.7",
 ]
 
 [[package]]
@@ -830,7 +1080,7 @@ version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a8894febbff9f758034a5b8e12d87918f56dfc64a8e1fe757d65e29041538d93"
 dependencies = [
- "generic-array",
+ "generic-array 0.14.7",
 ]
 
 [[package]]
@@ -855,6 +1105,40 @@ dependencies = [
  "piper",
 ]
 
+[[package]]
+name = "blowfish"
+version = "0.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e412e2cd0f2b2d93e02543ceae7917b3c70331573df19ee046bcbc35e45e87d7"
+dependencies = [
+ "byteorder",
+ "cipher",
+]
+
+[[package]]
+name = "borsh"
+version = "1.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cfd1e3f8955a5d7de9fab72fc8373fade9fb8a703968cb200ae3dc6cf08e185a"
+dependencies = [
+ "borsh-derive",
+ "bytes",
+ "cfg_aliases",
+]
+
+[[package]]
+name = "borsh-derive"
+version = "1.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bfcfdc083699101d5a7965e49925975f2f55060f94f9a05e7187be95d530ca59"
+dependencies = [
+ "once_cell",
+ "proc-macro-crate",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.117",
+]
+
 [[package]]
 name = "bs58"
 version = "0.5.1"
@@ -886,6 +1170,28 @@ version = "3.20.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5d20789868f4b01b2f2caec9f5c4e0213b41e3e5702a50157d699ae31ced2fcb"
 
+[[package]]
+name = "bytecheck"
+version = "0.6.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "23cdc57ce23ac53c931e88a43d06d070a6fd142f2617be5855eb75efc9beb1c2"
+dependencies = [
+ "bytecheck_derive",
+ "ptr_meta",
+ "simdutf8",
+]
+
+[[package]]
+name = "bytecheck_derive"
+version = "0.6.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3db406d29fbcd95542e92559bed4d8ad92636d1ca8b3b72ede10b4bcc010e659"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+]
+
 [[package]]
 name = "bytemuck"
 version = "1.25.0"
@@ -923,6 +1229,9 @@ name = "bytes"
 version = "1.11.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1e748733b7cbc798e1434b6ac524f0c1ff2ab456fe201501e6497c8417a4fc33"
+dependencies = [
+ "serde",
+]
 
 [[package]]
 name = "calloop"
@@ -950,6 +1259,15 @@ dependencies = [
  "wayland-client",
 ]
 
+[[package]]
+name = "castaway"
+version = "0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dec551ab6e7578819132c713a93c022a05d60159dc86e7a7050223577484c55a"
+dependencies = [
+ "rustversion",
+]
+
 [[package]]
 name = "cbc"
 version = "0.1.2"
@@ -966,7 +1284,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "eadd868a2ce9ca38de7eeafdcec9c7065ef89b42b32f0839278d55f35c54d1ff"
 dependencies = [
  "heck 0.4.1",
- "indexmap",
+ "indexmap 2.14.0",
  "log",
  "proc-macro2",
  "quote",
@@ -989,6 +1307,63 @@ dependencies = [
  "shlex",
 ]
 
+[[package]]
+name = "cedar-policy"
+version = "2.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3d91e3b10a0f7f2911774d5e49713c4d25753466f9e11d1cd2ec627f8a2dc857"
+dependencies = [
+ "cedar-policy-core",
+ "cedar-policy-validator",
+ "itertools 0.10.5",
+ "lalrpop-util",
+ "ref-cast",
+ "serde",
+ "serde_json",
+ "smol_str",
+ "thiserror 1.0.69",
+]
+
+[[package]]
+name = "cedar-policy-core"
+version = "2.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cd2315591c6b7e18f8038f0a0529f254235fd902b6c217aabc04f2459b0d9995"
+dependencies = [
+ "either",
+ "ipnet",
+ "itertools 0.10.5",
+ "lalrpop",
+ "lalrpop-util",
+ "lazy_static",
+ "miette",
+ "regex",
+ "rustc_lexer",
+ "serde",
+ "serde_json",
+ "serde_with",
+ "smol_str",
+ "stacker",
+ "thiserror 1.0.69",
+]
+
+[[package]]
+name = "cedar-policy-validator"
+version = "2.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e756e1b2a5da742ed97e65199ad6d0893e9aa4bd6b34be1de9e70bd1e6adc7df"
+dependencies = [
+ "cedar-policy-core",
+ "itertools 0.10.5",
+ "serde",
+ "serde_json",
+ "serde_with",
+ "smol_str",
+ "stacker",
+ "thiserror 1.0.69",
+ "unicode-security",
+]
+
 [[package]]
 name = "cexpr"
 version = "0.6.0"
@@ -1043,6 +1418,47 @@ dependencies = [
  "zeroize",
 ]
 
+[[package]]
+name = "chrono"
+version = "0.4.44"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c673075a2e0e5f4a1dde27ce9dee1ea4558c7ffe648f576438a20ca1d2acc4b0"
+dependencies = [
+ "iana-time-zone",
+ "js-sys",
+ "num-traits",
+ "serde",
+ "wasm-bindgen",
+ "windows-link 0.2.1",
+]
+
+[[package]]
+name = "ciborium"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "42e69ffd6f0917f5c029256a24d0161db17cea3997d185db0d35926308770f0e"
+dependencies = [
+ "ciborium-io",
+ "ciborium-ll",
+ "serde",
+]
+
+[[package]]
+name = "ciborium-io"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "05afea1e0a06c9be33d539b876f1ce3692f4afea2cb41f740e7743225ed1c757"
+
+[[package]]
+name = "ciborium-ll"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "57663b653d948a338bfb3eeba9bb2fd5fcfaecb9e199e87e1eda4d9e8b240fd9"
+dependencies = [
+ "ciborium-io",
+ "half",
+]
+
 [[package]]
 name = "cipher"
 version = "0.4.4"
@@ -1182,7 +1598,7 @@ checksum = "fe6d2e5af09e8c8ad56c969f2157a3d4238cebc7c55f0a517728c38f7b200f81"
 dependencies = [
  "serde",
  "termcolor",
- "unicode-width",
+ "unicode-width 0.2.2",
 ]
 
 [[package]]
@@ -1524,11 +1940,34 @@ version = "0.1.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "78c8292055d1c1df0cce5d180393dc8cce0abec0a7102adb6c7b1eef6016d60a"
 dependencies = [
- "generic-array",
+ "generic-array 0.14.7",
  "rand_core 0.6.4",
  "typenum",
 ]
 
+[[package]]
+name = "cssparser"
+version = "0.35.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4e901edd733a1472f944a45116df3f846f54d37e67e68640ac8bb69689aca2aa"
+dependencies = [
+ "cssparser-macros",
+ "dtoa-short",
+ "itoa",
+ "phf",
+ "smallvec",
+]
+
+[[package]]
+name = "cssparser-macros"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "13b588ba4ac1a99f7f2964d24b3d896ddc6bf847ee3855dbd4366f058cfcd331"
+dependencies = [
+ "quote",
+ "syn 2.0.117",
+]
+
 [[package]]
 name = "ctor"
 version = "0.4.3"
@@ -1581,6 +2020,53 @@ dependencies = [
  "syn 2.0.117",
 ]
 
+[[package]]
+name = "darling"
+version = "0.23.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "25ae13da2f202d56bd7f91c25fba009e7717a1e4a1cc98a76d844b65ae912e9d"
+dependencies = [
+ "darling_core",
+ "darling_macro",
+]
+
+[[package]]
+name = "darling_core"
+version = "0.23.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9865a50f7c335f53564bb694ef660825eb8610e0a53d3e11bf1b0d3df31e03b0"
+dependencies = [
+ "ident_case",
+ "proc-macro2",
+ "quote",
+ "strsim",
+ "syn 2.0.117",
+]
+
+[[package]]
+name = "darling_macro"
+version = "0.23.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3984ec7bd6cfa798e62b4a642426a5be0e68f9401cfc2a01e3fa9ea2fcdb8d"
+dependencies = [
+ "darling_core",
+ "quote",
+ "syn 2.0.117",
+]
+
+[[package]]
+name = "dashmap"
+version = "5.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "978747c1d849a7d2ee5e8adc0159961c48fb7e5db2f06af6723b80123bb53856"
+dependencies = [
+ "cfg-if",
+ "hashbrown 0.14.5",
+ "lock_api",
+ "once_cell",
+ "parking_lot_core 0.9.12",
+]
+
 [[package]]
 name = "data-encoding"
 version = "2.11.0"
@@ -1650,6 +2136,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7cd812cc2bc1d69d4764bd80df88b4317eaef9e773c75226407d9bc0876b211c"
 dependencies = [
  "powerfmt",
+ "serde_core",
 ]
 
 [[package]]
@@ -1665,6 +2152,12 @@ dependencies = [
  "syn 2.0.117",
 ]
 
+[[package]]
+name = "deunicode"
+version = "1.6.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "abd57806937c9cc163efc8ea3910e00a62e2aeb0b8119f1793a978088f8f6b04"
+
 [[package]]
 name = "digest"
 version = "0.10.7"
@@ -1694,6 +2187,16 @@ dependencies = [
  "dirs-sys 0.4.1",
 ]
 
+[[package]]
+name = "dirs-next"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b98cf8ebf19c3d1b223e151f99a4f9f0690dca41414773390fc824184ac833e1"
+dependencies = [
+ "cfg-if",
+ "dirs-sys-next",
+]
+
 [[package]]
 name = "dirs-sys"
 version = "0.3.7"
@@ -1717,6 +2220,17 @@ dependencies = [
  "windows-sys 0.48.0",
 ]
 
+[[package]]
+name = "dirs-sys-next"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4ebda144c4fe02d1f7ea1a7d9641b6fc6b580adcfa024ae48797ecdeb6825b4d"
+dependencies = [
+ "libc",
+ "redox_users",
+ "winapi",
+]
+
 [[package]]
 name = "dispatch"
 version = "0.2.0"
@@ -1753,6 +2267,22 @@ dependencies = [
  "libloading",
 ]
 
+[[package]]
+name = "dmp"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bb2dfc7a18dffd3ef60a442b72a827126f1557d914620f8fc4d1049916da43c1"
+dependencies = [
+ "trice",
+ "urlencoding",
+]
+
+[[package]]
+name = "double-ended-peekable"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c0d05e1c0dbad51b52c38bda7adceef61b9efc2baf04acfe8726a8c4630a6f57"
+
 [[package]]
 name = "downcast-rs"
 version = "1.2.1"
@@ -1765,6 +2295,15 @@ version = "1.0.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4c3cf4824e2d5f025c7b531afcb2325364084a16806f6d47fbc1f5fbd9960590"
 
+[[package]]
+name = "dtoa-short"
+version = "0.3.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cd1511a7b6a56299bd043a9c167a6d2bfb37bf84a6dfceaba651168adfb43c87"
+dependencies = [
+ "dtoa",
+]
+
 [[package]]
 name = "dtor"
 version = "0.0.6"
@@ -1804,6 +2343,16 @@ version = "1.0.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d0881ea181b1df73ff77ffaaf9c7544ecc11e82fba9b5f27b262a3c73a332555"
 
+[[package]]
+name = "earcutr"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "79127ed59a85d7687c409e9978547cffb7dc79675355ed22da6b66fd5f6ead01"
+dependencies = [
+ "itertools 0.11.0",
+ "num-traits",
+]
+
 [[package]]
 name = "ed25519"
 version = "2.2.3"
@@ -1860,6 +2409,15 @@ version = "0.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "edd0f118536f44f5ccd48bcb8b111bdc3de888b58c74639dfb034a357d0f206d"
 
+[[package]]
+name = "ena"
+version = "0.14.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eabffdaee24bd1bf95c5ef7cec31260444317e72ea56c4c91750e8b7ee58d5f1"
+dependencies = [
+ "log",
+]
+
 [[package]]
 name = "encoding_rs"
 version = "0.8.35"
@@ -1875,6 +2433,12 @@ version = "1.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "66b7e2430c6dff6a955451e2cfc438f09cea1965a9d6f87f7e3b90decc014099"
 
+[[package]]
+name = "endian-type"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c34f04666d835ff5d62e058c3995147c06f42fe86ff053337632bca83e42702d"
+
 [[package]]
 name = "ente-binfmt-compat"
 version = "0.0.1"
@@ -1889,7 +2453,7 @@ name = "ente-brain"
 version = "0.0.1"
 dependencies = [
  "anyhow",
- "base64",
+ "base64 0.22.1",
  "bincode",
  "ente-card",
  "ente-cas",
@@ -2333,6 +2897,19 @@ dependencies = [
  "zune-inflate",
 ]
 
+[[package]]
+name = "ext-sort"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cf5d3b056bcc471d38082b8c453acb6670f7327fd44219b3c411e40834883569"
+dependencies = [
+ "log",
+ "rayon",
+ "rmp-serde",
+ "serde",
+ "tempfile",
+]
+
 [[package]]
 name = "fallible-iterator"
 version = "0.3.0"
@@ -2409,6 +2986,12 @@ version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5baebc0774151f905a1a2cc41989300b1e6fbb29aff0ceffa1064fdd3088d582"
 
+[[package]]
+name = "fixedbitset"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0ce7134b9999ecaf8bcd65542e436736ef32ddca1b3e06094cb6ec5755203b80"
+
 [[package]]
 name = "flate2"
 version = "1.1.9"
@@ -2461,6 +3044,12 @@ version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d9c4f5dac5e15c24eb999c26181a6ca40b39fe946cbe4c263c7209467bc83af2"
 
+[[package]]
+name = "foldhash"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "77ce24cb58228fbb8aa041425bb1050850ac19177686ea6e0f41a70416f56fdb"
+
 [[package]]
 name = "font-types"
 version = "0.11.3"
@@ -2573,6 +3162,18 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "fst"
+version = "0.4.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7ab85b9b05e3978cc9a9cf8fea7f01b494e1a09ed3037e16ba39edc7a29eb61a"
+
+[[package]]
+name = "funty"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6d5a32815ae3f33302d95fdcb2ce17862f8c65363dcfd29360480ba1001fc9c"
+
 [[package]]
 name = "futf"
 version = "0.1.5"
@@ -2726,6 +3327,15 @@ dependencies = [
  "slab",
 ]
 
+[[package]]
+name = "fuzzy-matcher"
+version = "0.3.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "54614a3312934d066701a80f20f15fa3b56d67ac7722b39eea5b4c9dd1d66c94"
+dependencies = [
+ "thread_local",
+]
+
 [[package]]
 name = "fxhash"
 version = "0.2.1"
@@ -2735,6 +3345,24 @@ dependencies = [
  "byteorder",
 ]
 
+[[package]]
+name = "generic-array"
+version = "0.12.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ffdf9f34f1447443d37393cc6c2b8313aebddcd96906caf34e54c68d8e57d7bd"
+dependencies = [
+ "typenum",
+]
+
+[[package]]
+name = "generic-array"
+version = "0.13.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f797e67af32588215eaaab8327027ee8e71b9dd0b2b26996aedf20c030fce309"
+dependencies = [
+ "typenum",
+]
+
 [[package]]
 name = "generic-array"
 version = "0.14.7"
@@ -2745,6 +3373,49 @@ dependencies = [
  "version_check",
 ]
 
+[[package]]
+name = "geo"
+version = "0.28.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f811f663912a69249fa620dcd2a005db7254529da2d8a0b23942e81f47084501"
+dependencies = [
+ "earcutr",
+ "float_next_after",
+ "geo-types",
+ "geographiclib-rs",
+ "log",
+ "num-traits",
+ "robust",
+ "rstar 0.12.2",
+ "serde",
+ "spade",
+]
+
+[[package]]
+name = "geo-types"
+version = "0.7.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "94776032c45f950d30a13af6113c2ad5625316c9abfbccee4dd5a6695f8fe0f5"
+dependencies = [
+ "approx 0.5.1",
+ "num-traits",
+ "rstar 0.10.0",
+ "rstar 0.11.0",
+ "rstar 0.12.2",
+ "rstar 0.8.4",
+ "rstar 0.9.3",
+ "serde",
+]
+
+[[package]]
+name = "geographiclib-rs"
+version = "0.2.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c5a7f08910fd98737a6eda7568e7c5e645093e073328eeef49758cfe8b0489c7"
+dependencies = [
+ "libm",
+]
+
 [[package]]
 name = "gethostname"
 version = "1.1.0"
@@ -2953,7 +3624,7 @@ dependencies = [
  "rand 0.9.4",
  "raw-window-handle",
  "resvg",
- "schemars",
+ "schemars 1.2.1",
  "seahash",
  "serde",
  "serde_json",
@@ -3002,7 +3673,7 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ae39dc6d3d201be97e4bc08d96dbef2bc5b5c3d5734e05786e8cc3043342351c"
 dependencies = [
- "indexmap",
+ "indexmap 2.14.0",
  "rustc-hash 2.1.2",
 ]
 
@@ -3122,7 +3793,7 @@ dependencies = [
  "nix 0.29.0",
  "regex",
  "rust-embed",
- "schemars",
+ "schemars 1.2.1",
  "serde",
  "serde_json",
  "serde_json_lenient",
@@ -3165,7 +3836,7 @@ dependencies = [
  "futures-core",
  "futures-sink",
  "http",
- "indexmap",
+ "indexmap 2.14.0",
  "slab",
  "tokio",
  "tokio-util",
@@ -3184,6 +3855,15 @@ dependencies = [
  "zerocopy",
 ]
 
+[[package]]
+name = "hash32"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d4041af86e63ac4298ce40e5cca669066e75b6f1aa3390fe2561ffa5e1d9f4cc"
+dependencies = [
+ "byteorder",
+]
+
 [[package]]
 name = "hash32"
 version = "0.2.1"
@@ -3193,13 +3873,32 @@ dependencies = [
  "byteorder",
 ]
 
+[[package]]
+name = "hash32"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "47d60b12902ba28e2730cd37e95b8c9223af2808df9e902d4df49588d1470606"
+dependencies = [
+ "byteorder",
+]
+
+[[package]]
+name = "hashbrown"
+version = "0.12.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8a9ee70c43aaf417c914396645a0fa852624801b24ebb7ae78fe8272889ac888"
+dependencies = [
+ "ahash 0.7.8",
+]
+
 [[package]]
 name = "hashbrown"
 version = "0.14.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e5274423e17b7c9fc20b6e7e208532f9b19825d82dfd615708b70edd83df41f1"
 dependencies = [
- "ahash",
+ "ahash 0.8.12",
+ "allocator-api2",
 ]
 
 [[package]]
@@ -3208,7 +3907,20 @@ version = "0.15.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9229cfe53dfd69f0609a49f65461bd93001ea1ef889cd5529dd176593f5338a1"
 dependencies = [
- "foldhash",
+ "allocator-api2",
+ "equivalent",
+ "foldhash 0.1.5",
+]
+
+[[package]]
+name = "hashbrown"
+version = "0.16.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "841d1cc9bed7f9236f321df977030373f4a4163ae1a7dbfe1a51a2c1a51d9100"
+dependencies = [
+ "allocator-api2",
+ "equivalent",
+ "foldhash 0.2.0",
 ]
 
 [[package]]
@@ -3235,6 +3947,18 @@ dependencies = [
  "hashbrown 0.15.5",
 ]
 
+[[package]]
+name = "heapless"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "634bd4d29cbf24424d0a4bfcbf80c6960129dc24424752a7d1d1390607023422"
+dependencies = [
+ "as-slice 0.1.5",
+ "generic-array 0.14.7",
+ "hash32 0.1.1",
+ "stable_deref_trait",
+]
+
 [[package]]
 name = "heapless"
 version = "0.7.17"
@@ -3242,13 +3966,23 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cdc6457c0eb62c71aac4bc17216026d8410337c4126773b9c5daba343f17964f"
 dependencies = [
  "atomic-polyfill",
- "hash32",
+ "hash32 0.2.1",
  "rustc_version",
  "serde",
  "spin",
  "stable_deref_trait",
 ]
 
+[[package]]
+name = "heapless"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0bfb9eb618601c89945a70e254898da93b13be0388091d42117462b265bb3fad"
+dependencies = [
+ "hash32 0.3.1",
+ "stable_deref_trait",
+]
+
 [[package]]
 name = "heck"
 version = "0.4.1"
@@ -3364,6 +4098,17 @@ dependencies = [
  "windows-sys 0.61.2",
 ]
 
+[[package]]
+name = "html5ever"
+version = "0.35.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "55d958c2f74b664487a2035fe1dadb032c48718a03b63f3ab0b8537db8549ed4"
+dependencies = [
+ "log",
+ "markup5ever",
+ "match_token",
+]
+
 [[package]]
 name = "http"
 version = "1.4.0"
@@ -3403,6 +4148,12 @@ version = "1.10.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6dbf3de79e51f3d586ab4cb9d5c3e2c14aa28ed23d180cf89b4df0454a69cc87"
 
+[[package]]
+name = "humantime"
+version = "2.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "135b12329e5e3ce057a9f972339ea52bc954fe1e9358ef27f95e89716fbc5424"
+
 [[package]]
 name = "hyper"
 version = "1.9.0"
@@ -3460,6 +4211,30 @@ dependencies = [
  "tracing",
 ]
 
+[[package]]
+name = "iana-time-zone"
+version = "0.1.65"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e31bc9ad994ba00e440a8aa5c9ef0ec67d5cb5e5cb0cc7f8b744a35b389cc470"
+dependencies = [
+ "android_system_properties",
+ "core-foundation-sys",
+ "iana-time-zone-haiku",
+ "js-sys",
+ "log",
+ "wasm-bindgen",
+ "windows-core 0.62.2",
+]
+
+[[package]]
+name = "iana-time-zone-haiku"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f31827a206f56af32e590ba56d5d2d085f558508192593743f16b2306495269f"
+dependencies = [
+ "cc",
+]
+
 [[package]]
 name = "icu_collections"
 version = "2.2.0"
@@ -3548,6 +4323,12 @@ version = "2.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3d3067d79b975e8844ca9eb072e16b31c3c1c36928edf9c6789548c524d0d954"
 
+[[package]]
+name = "ident_case"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b9e0384b61958566e926dc50660321d12159025e767c18e043daf26b70104c39"
+
 [[package]]
 name = "idna"
 version = "1.1.0"
@@ -3669,6 +4450,17 @@ version = "1.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "40fac9d56ed6437b198fddba683305e8e2d651aa42647f00f5ae542e7f5c94a2"
 
+[[package]]
+name = "indexmap"
+version = "1.9.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bd070e393353796e801d209ad339e89596eb4c8d430d18ede6a1cced8fafbd99"
+dependencies = [
+ "autocfg",
+ "hashbrown 0.12.3",
+ "serde",
+]
+
 [[package]]
 name = "indexmap"
 version = "2.14.0"
@@ -3708,7 +4500,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "879f10e63c20629ecabbb64a8010319738c66a5cd0c29b02d63d272b03751d01"
 dependencies = [
  "block-padding",
- "generic-array",
+ "generic-array 0.14.7",
 ]
 
 [[package]]
@@ -3796,6 +4588,24 @@ version = "1.70.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a6cb138bb79a146c1bd460005623e142ef0181e3d0219cb493e02f7d08a35695"
 
+[[package]]
+name = "itertools"
+version = "0.10.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b0fd2260e829bddf4cb6ea802289de2f86d6a7a690192fbe91b3f46e0f2c8473"
+dependencies = [
+ "either",
+]
+
+[[package]]
+name = "itertools"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b1c173a5686ce8bfa551b3563d0c2170bf24ca44da99c7ca4bfdab5418c3fe57"
+dependencies = [
+ "either",
+]
+
 [[package]]
 name = "itertools"
 version = "0.13.0"
@@ -3842,6 +4652,21 @@ dependencies = [
  "wasm-bindgen",
 ]
 
+[[package]]
+name = "jsonwebtoken"
+version = "9.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5a87cc7a48537badeae96744432de36f4be2b4a34a05a5ef32e9dd8a1c169dde"
+dependencies = [
+ "base64 0.22.1",
+ "js-sys",
+ "pem",
+ "ring",
+ "serde",
+ "serde_json",
+ "simple_asn1",
+]
+
 [[package]]
 name = "khronos-egl"
 version = "6.0.0"
@@ -3892,6 +4717,37 @@ dependencies = [
  "log",
 ]
 
+[[package]]
+name = "lalrpop"
+version = "0.20.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "55cb077ad656299f160924eb2912aa147d7339ea7d69e1b5517326fdcec3c1ca"
+dependencies = [
+ "ascii-canvas",
+ "bit-set 0.5.3",
+ "ena",
+ "itertools 0.11.0",
+ "lalrpop-util",
+ "petgraph",
+ "pico-args",
+ "regex",
+ "regex-syntax",
+ "string_cache",
+ "term",
+ "tiny-keccak",
+ "unicode-xid",
+ "walkdir",
+]
+
+[[package]]
+name = "lalrpop-util"
+version = "0.20.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "507460a910eb7b32ee961886ff48539633b788a36b65692b95f225b844c82553"
+dependencies = [
+ "regex-automata",
+]
+
 [[package]]
 name = "lazy_static"
 version = "1.5.0"
@@ -3928,6 +4784,15 @@ version = "0.5.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7a79a3332a6609480d7d0c9eab957bca6b455b91bb84e66d19f5ff66294b85b8"
 
+[[package]]
+name = "lexicmp"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7378d131ddf24063b32cbd7e91668d183140c4b3906270635a4d633d1068ea5d"
+dependencies = [
+ "any_ascii",
+]
+
 [[package]]
 name = "libc"
 version = "0.2.186"
@@ -4337,6 +5202,18 @@ dependencies = [
  "vcpkg",
 ]
 
+[[package]]
+name = "linfa-linalg"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "56e7562b41c8876d3367897067013bb2884cc78e6893f092ecd26b305176ac82"
+dependencies = [
+ "ndarray",
+ "num-traits",
+ "rand 0.8.6",
+ "thiserror 1.0.69",
+]
+
 [[package]]
 name = "linux-raw-sys"
 version = "0.4.15"
@@ -4383,6 +5260,15 @@ dependencies = [
  "imgref",
 ]
 
+[[package]]
+name = "lru"
+version = "0.12.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "234cf4f4a04dc1f57e24b96cc0cd600cf2af460d4161ac5ecdd0af8e1f3b2a38"
+dependencies = [
+ "hashbrown 0.15.5",
+]
+
 [[package]]
 name = "lru-slab"
 version = "0.1.2"
@@ -4456,6 +5342,23 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "maplit"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3e2e65a1a2e43cfcb47a895c4c8b10d1f4a61097f9f254f183aee60cad9c651d"
+
+[[package]]
+name = "markup5ever"
+version = "0.35.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "311fe69c934650f8f19652b3946075f0fc41ad8757dbb68f1ca14e7900ecc1c3"
+dependencies = [
+ "log",
+ "tendril",
+ "web_atoms",
+]
+
 [[package]]
 name = "match-lookup"
 version = "0.1.2"
@@ -4467,6 +5370,17 @@ dependencies = [
  "syn 2.0.117",
 ]
 
+[[package]]
+name = "match_token"
+version = "0.35.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac84fd3f360fcc43dc5f5d186f02a94192761a080e8bc58621ad4d12296a58cf"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.117",
+]
+
 [[package]]
 name = "matchers"
 version = "0.2.0"
@@ -4476,6 +5390,16 @@ dependencies = [
  "regex-automata",
 ]
 
+[[package]]
+name = "matrixmultiply"
+version = "0.3.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a06de3016e9fae57a36fd14dba131fccf49f74b40b7fbdb472f96e361ec71a08"
+dependencies = [
+ "autocfg",
+ "rawpointer",
+]
+
 [[package]]
 name = "maybe-rayon"
 version = "0.1.1"
@@ -4535,6 +5459,29 @@ dependencies = [
  "paste",
 ]
 
+[[package]]
+name = "miette"
+version = "5.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "59bb584eaeeab6bd0226ccf3509a69d7936d148cf3d036ad350abe35e8c6856e"
+dependencies = [
+ "miette-derive",
+ "once_cell",
+ "thiserror 1.0.69",
+ "unicode-width 0.1.14",
+]
+
+[[package]]
+name = "miette-derive"
+version = "5.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "49e7bc1560b95a3c4a25d03de42fe76ca718ab92d1a22a55b9b4cf67b3ae635c"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.117",
+]
+
 [[package]]
 name = "mime"
 version = "0.3.17"
@@ -4695,6 +5642,23 @@ dependencies = [
  "pxfm",
 ]
 
+[[package]]
+name = "multer"
+version = "3.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83e87776546dc87511aa5ee218730c92b666d7264ab6ed41f9d215af9cd5224b"
+dependencies = [
+ "bytes",
+ "encoding_rs",
+ "futures-util",
+ "http",
+ "httparse",
+ "memchr",
+ "mime",
+ "spin",
+ "version_check",
+]
+
 [[package]]
 name = "multi-stash"
 version = "0.2.0"
@@ -4762,14 +5726,14 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2b977c445f26e49757f9aca3631c3b8b836942cb278d69a92e7b80d3b24da632"
 dependencies = [
  "arrayvec",
- "bit-set",
+ "bit-set 0.8.0",
  "bitflags 2.11.1",
  "cfg_aliases",
  "codespan-reporting",
  "half",
  "hashbrown 0.15.5",
  "hexf-parse",
- "indexmap",
+ "indexmap 2.14.0",
  "log",
  "num-traits",
  "once_cell",
@@ -4780,6 +5744,21 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "nakui-core"
+version = "0.1.0"
+dependencies = [
+ "petgraph",
+ "rhai",
+ "serde",
+ "serde_json",
+ "sha2",
+ "surrealdb",
+ "thiserror 1.0.69",
+ "tokio",
+ "uuid",
+]
+
 [[package]]
 name = "nanorand"
 version = "0.7.0"
@@ -4789,6 +5768,35 @@ dependencies = [
  "getrandom 0.2.17",
 ]
 
+[[package]]
+name = "ndarray"
+version = "0.15.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "adb12d4e967ec485a5f71c6311fe28158e9d6f4bc4a447b474184d0f91a8fa32"
+dependencies = [
+ "approx 0.4.0",
+ "matrixmultiply",
+ "num-complex",
+ "num-integer",
+ "num-traits",
+ "rawpointer",
+]
+
+[[package]]
+name = "ndarray-stats"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "af5a8477ac96877b5bd1fd67e0c28736c12943aba24eda92b127e036b0c8f400"
+dependencies = [
+ "indexmap 1.9.3",
+ "itertools 0.10.5",
+ "ndarray",
+ "noisy_float",
+ "num-integer",
+ "num-traits",
+ "rand 0.8.6",
+]
+
 [[package]]
 name = "netlink-packet-core"
 version = "0.8.1"
@@ -4843,6 +5851,15 @@ version = "1.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "650eef8c711430f1a879fdd01d4745a7deea475becfb90269c06775983bbf086"
 
+[[package]]
+name = "nibble_vec"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "77a5d83df9f36fe23f0c3648c6bbb8b0298bb5f1939c8f2704431371f4b84d43"
+dependencies = [
+ "smallvec",
+]
+
 [[package]]
 name = "nix"
 version = "0.29.0"
@@ -4895,6 +5912,15 @@ version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2bf50223579dc7cdcfb3bfcacf7069ff68243f8c363f62ffa99cf000a6b9c451"
 
+[[package]]
+name = "noisy_float"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c16843be85dd410c6a12251c4eca0dd1d3ee8c5725f746c4d5e0fdcec0a864b2"
+dependencies = [
+ "num-traits",
+]
+
 [[package]]
 name = "nom"
 version = "7.1.3"
@@ -5211,6 +6237,30 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "object_store"
+version = "0.12.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fbfbfff40aeccab00ec8a910b57ca8ecf4319b335c542f2edcd19dd25a1e2a00"
+dependencies = [
+ "async-trait",
+ "bytes",
+ "chrono",
+ "futures",
+ "http",
+ "humantime",
+ "itertools 0.14.0",
+ "parking_lot 0.12.5",
+ "percent-encoding",
+ "thiserror 2.0.18",
+ "tokio",
+ "tracing",
+ "url",
+ "walkdir",
+ "wasm-bindgen-futures",
+ "web-time",
+]
+
 [[package]]
 name = "oid-registry"
 version = "0.8.1"
@@ -5387,6 +6437,12 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "35fb2e5f958ec131621fdd531e9fc186ed768cbe395337403ae56c17a74c68ec"
 
+[[package]]
+name = "path-clean"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "17359afc20d7ab31fdb42bb844c8b3bb1dabd7dcf7e68428492da7f16966fcef"
+
 [[package]]
 name = "pathdiff"
 version = "0.2.3"
@@ -5420,15 +6476,23 @@ checksum = "f8ed6a7761f76e3b9f92dfb0a60a6a6477c61024b775147ff0973a02653abaf2"
 dependencies = [
  "digest",
  "hmac",
+ "password-hash",
+ "sha2",
 ]
 
+[[package]]
+name = "pdqselect"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4ec91767ecc0a0bbe558ce8c9da33c068066c57ecc8bb8477ef8c1ad3ef77c27"
+
 [[package]]
 name = "pem"
 version = "3.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1d30c53c26bc5b31a98cd02d20f25a7c8567146caf63ed593a9d87b2775291be"
 dependencies = [
- "base64",
+ "base64 0.22.1",
  "serde_core",
 ]
 
@@ -5438,6 +6502,90 @@ version = "2.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9b4f627cb1b25917193a259e49bdad08f671f8d9708acfd5fe0a8c1455d87220"
 
+[[package]]
+name = "pest"
+version = "2.8.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e0848c601009d37dfa3430c4666e147e49cdcf1b92ecd3e63657d8a5f19da662"
+dependencies = [
+ "memchr",
+ "ucd-trie",
+]
+
+[[package]]
+name = "petgraph"
+version = "0.6.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b4c5cc86750666a3ed20bdaf5ca2a0344f9c67674cae0515bec2da16fbaa47db"
+dependencies = [
+ "fixedbitset",
+ "indexmap 2.14.0",
+]
+
+[[package]]
+name = "pharos"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e9567389417feee6ce15dd6527a8a1ecac205ef62c2932bcf3d9f6fc5b78b414"
+dependencies = [
+ "futures",
+ "rustc_version",
+]
+
+[[package]]
+name = "phf"
+version = "0.11.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1fd6780a80ae0c52cc120a26a1a42c1ae51b247a253e4e06113d23d2c2edd078"
+dependencies = [
+ "phf_macros",
+ "phf_shared",
+]
+
+[[package]]
+name = "phf_codegen"
+version = "0.11.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aef8048c789fa5e851558d709946d6d79a8ff88c0440c587967f8e94bfb1216a"
+dependencies = [
+ "phf_generator",
+ "phf_shared",
+]
+
+[[package]]
+name = "phf_generator"
+version = "0.11.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3c80231409c20246a13fddb31776fb942c38553c51e871f8cbd687a4cfb5843d"
+dependencies = [
+ "phf_shared",
+ "rand 0.8.6",
+]
+
+[[package]]
+name = "phf_macros"
+version = "0.11.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f84ac04429c13a7ff43785d75ad27569f2951ce0ffd30a3321230db2fc727216"
+dependencies = [
+ "phf_generator",
+ "phf_shared",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.117",
+ "unicase",
+]
+
+[[package]]
+name = "phf_shared"
+version = "0.11.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "67eabc2ef2a60eb7faa00097bd1ffdb5bd28e62bf39990626a582201b7a754e5"
+dependencies = [
+ "siphasher",
+ "unicase",
+]
+
 [[package]]
 name = "pico-args"
 version = "0.5.0"
@@ -5610,7 +6758,7 @@ dependencies = [
  "cobs",
  "embedded-io 0.4.0",
  "embedded-io 0.6.1",
- "heapless",
+ "heapless 0.7.17",
  "serde",
 ]
 
@@ -5638,6 +6786,12 @@ dependencies = [
  "zerocopy",
 ]
 
+[[package]]
+name = "precomputed-hash"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "925383efa346730478fb4838dbe9137d2a47675ad789c546d150a6e1dd4ab31c"
+
 [[package]]
 name = "prettyplease"
 version = "0.2.37"
@@ -5730,6 +6884,12 @@ dependencies = [
  "syn 2.0.117",
 ]
 
+[[package]]
+name = "psl-types"
+version = "2.0.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "33cb294fe86a74cbcf50d4445b37da762029549ebeea341421c7c70370f86cac"
+
 [[package]]
 name = "psm"
 version = "0.1.31"
@@ -5740,6 +6900,26 @@ dependencies = [
  "cc",
 ]
 
+[[package]]
+name = "ptr_meta"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0738ccf7ea06b608c10564b31debd4f5bc5e197fc8bfe088f68ae5ce81e7a4f1"
+dependencies = [
+ "ptr_meta_derive",
+]
+
+[[package]]
+name = "ptr_meta_derive"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "16b845dbfca988fa33db069c0e230574d15a3088f147a87b64c7589eb662c9ac"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+]
+
 [[package]]
 name = "pxfm"
 version = "0.1.29"
@@ -5801,6 +6981,30 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "quick_cache"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eb55a1aa7668676bb93926cd4e9cdfe60f03bb866553bcca9112554911b6d3dc"
+dependencies = [
+ "ahash 0.8.12",
+ "equivalent",
+ "hashbrown 0.14.5",
+ "parking_lot 0.12.5",
+]
+
+[[package]]
+name = "quick_cache"
+version = "0.6.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5a70b1b8b47e31d0498ecbc3c5470bb931399a8bfed1fd79d1717a61ce7f96e3"
+dependencies = [
+ "ahash 0.8.12",
+ "equivalent",
+ "hashbrown 0.16.1",
+ "parking_lot 0.12.5",
+]
+
 [[package]]
 name = "quinn"
 version = "0.11.9"
@@ -5878,6 +7082,23 @@ version = "6.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f8dcc9c7d52a811697d2151c701e0d08956f92b0e24136cf4cf27b57a6a0d9bf"
 
+[[package]]
+name = "radium"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dc33ff2d4973d518d823d61aa239014831e521c75da58e3df4840d3f47749d09"
+
+[[package]]
+name = "radix_trie"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c069c179fcdc6a2fe24d8d18305cf085fdbd4f922c041943e203685d6a1c58fd"
+dependencies = [
+ "endian-type",
+ "nibble_vec",
+ "serde",
+]
+
 [[package]]
 name = "rand"
 version = "0.8.6"
@@ -6011,6 +7232,12 @@ dependencies = [
  "raw-window-handle",
 ]
 
+[[package]]
+name = "rawpointer"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "60a357793950651c4ed0f3f52338f53b2f809f32d83a07f72909fa13e4c6c1e3"
+
 [[package]]
 name = "rayon"
 version = "1.12.0"
@@ -6054,6 +7281,12 @@ dependencies = [
  "font-types",
 ]
 
+[[package]]
+name = "reblessive"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bbc4a4ea2a66a41a1152c4b3d86e8954dc087bdf33af35446e6e176db4e73c8c"
+
 [[package]]
 name = "redox_syscall"
 version = "0.2.16"
@@ -6141,6 +7374,15 @@ version = "0.8.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dc897dd8d9e8bd1ed8cdad82b5966c3e0ecae09fb1907d58efaa013543185d0a"
 
+[[package]]
+name = "rend"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "71fe3824f5629716b1589be05dacd749f6aa084c87e00e016714a8cdfccc997c"
+dependencies = [
+ "bytecheck",
+]
+
 [[package]]
 name = "resolv-conf"
 version = "0.7.6"
@@ -6161,6 +7403,52 @@ dependencies = [
  "usvg",
 ]
 
+[[package]]
+name = "revision"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "22f53179a035f881adad8c4d58a2c599c6b4a8325b989c68d178d7a34d1b1e4c"
+dependencies = [
+ "revision-derive 0.10.0",
+]
+
+[[package]]
+name = "revision"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "54b8ee532f15b2f0811eb1a50adf10d036e14a6cdae8d99893e7f3b921cb227d"
+dependencies = [
+ "chrono",
+ "geo",
+ "regex",
+ "revision-derive 0.11.0",
+ "roaring",
+ "rust_decimal",
+ "uuid",
+]
+
+[[package]]
+name = "revision-derive"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5f0ec466e5d8dca9965eb6871879677bef5590cf7525ad96cae14376efb75073"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.117",
+]
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+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.117",
+]
+
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@@ -6170,6 +7458,35 @@ dependencies = [
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 ]
 
+[[package]]
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+dependencies = [
+ "ahash 0.8.12",
+ "bitflags 2.11.1",
+ "num-traits",
+ "once_cell",
+ "rhai_codegen",
+ "serde",
+ "smallvec",
+ "smartstring",
+ "thin-vec",
+ "web-time",
+]
+
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d4322a2a4e8cf30771dd9f27f7f37ca9ac8fe812dddd811096a98483080dabe6"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.117",
+]
+
 [[package]]
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@@ -6184,6 +7501,80 @@ dependencies = [
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 ]
 
+[[package]]
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+dependencies = [
+ "bitvec",
+ "bytecheck",
+ "bytes",
+ "hashbrown 0.12.3",
+ "ptr_meta",
+ "rend",
+ "rkyv_derive",
+ "seahash",
+ "tinyvec",
+ "uuid",
+]
+
+[[package]]
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+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+]
+
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+dependencies = [
+ "num-traits",
+]
+
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+dependencies = [
+ "rmp",
+ "serde",
+]
+
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+dependencies = [
+ "rmp",
+]
+
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+dependencies = [
+ "bytemuck",
+ "byteorder",
+ "serde",
+]
+
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+
 [[package]]
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@@ -6201,6 +7592,67 @@ dependencies = [
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+[[package]]
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+dependencies = [
+ "heapless 0.6.1",
+ "num-traits",
+ "pdqselect",
+ "serde",
+ "smallvec",
+]
+
+[[package]]
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+checksum = "b40f1bfe5acdab44bc63e6699c28b74f75ec43afb59f3eda01e145aff86a25fa"
+dependencies = [
+ "heapless 0.7.17",
+ "num-traits",
+ "serde",
+ "smallvec",
+]
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1f39465655a1e3d8ae79c6d9e007f4953bfc5d55297602df9dc38f9ae9f1359a"
+dependencies = [
+ "heapless 0.7.17",
+ "num-traits",
+ "serde",
+ "smallvec",
+]
+
+[[package]]
+name = "rstar"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "73111312eb7a2287d229f06c00ff35b51ddee180f017ab6dec1f69d62ac098d6"
+dependencies = [
+ "heapless 0.7.17",
+ "num-traits",
+ "serde",
+ "smallvec",
+]
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "421400d13ccfd26dfa5858199c30a5d76f9c54e0dba7575273025b43c5175dbb"
+dependencies = [
+ "heapless 0.8.0",
+ "num-traits",
+ "serde",
+ "smallvec",
+]
+
 [[package]]
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 version = "0.20.0"
@@ -6278,6 +7730,33 @@ dependencies = [
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 ]
 
+[[package]]
+name = "rust-stemmers"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e46a2036019fdb888131db7a4c847a1063a7493f971ed94ea82c67eada63ca54"
+dependencies = [
+ "serde",
+ "serde_derive",
+]
+
+[[package]]
+name = "rust_decimal"
+version = "1.42.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c5108e3d4d903e21aac27f12ba5377b6b34f9f44b325e4894c7924169d06995"
+dependencies = [
+ "arrayvec",
+ "borsh",
+ "bytes",
+ "num-traits",
+ "rand 0.8.6",
+ "rkyv",
+ "serde",
+ "serde_json",
+ "wasm-bindgen",
+]
+
 [[package]]
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 version = "1.1.0"
@@ -6290,6 +7769,15 @@ version = "2.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "94300abf3f1ae2e2b8ffb7b58043de3d399c73fa6f4b73826402a5c457614dbe"
 
+[[package]]
+name = "rustc_lexer"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c86aae0c77166108c01305ee1a36a1e77289d7dc6ca0a3cd91ff4992de2d16a5"
+dependencies = [
+ "unicode-xid",
+]
+
 [[package]]
 name = "rustc_version"
 version = "0.4.1"
@@ -6448,6 +7936,15 @@ version = "1.0.23"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9774ba4a74de5f7b1c1451ed6cd5285a32eddb5cccb8cc655a4e50009e06477f"
 
+[[package]]
+name = "salsa20"
+version = "0.10.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "97a22f5af31f73a954c10289c93e8a50cc23d971e80ee446f1f6f7137a088213"
+dependencies = [
+ "cipher",
+]
+
 [[package]]
 name = "same-file"
 version = "1.0.6"
@@ -6466,6 +7963,18 @@ dependencies = [
  "windows-sys 0.61.2",
 ]
 
+[[package]]
+name = "schemars"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4cd191f9397d57d581cddd31014772520aa448f65ef991055d7f61582c65165f"
+dependencies = [
+ "dyn-clone",
+ "ref-cast",
+ "serde",
+ "serde_json",
+]
+
 [[package]]
 name = "schemars"
 version = "1.2.1"
@@ -6473,7 +7982,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a2b42f36aa1cd011945615b92222f6bf73c599a102a300334cd7f8dbeec726cc"
 dependencies = [
  "dyn-clone",
- "indexmap",
+ "indexmap 2.14.0",
  "ref-cast",
  "schemars_derive",
  "serde",
@@ -6527,6 +8036,18 @@ dependencies = [
  "once_cell",
 ]
 
+[[package]]
+name = "scrypt"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0516a385866c09368f0b5bcd1caff3366aace790fcd46e2bb032697bb172fd1f"
+dependencies = [
+ "password-hash",
+ "pbkdf2",
+ "salsa20",
+ "sha2",
+]
+
 [[package]]
 name = "seahash"
 version = "4.1.0"
@@ -6567,6 +8088,16 @@ name = "semver"
 version = "1.0.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8a7852d02fc848982e0c167ef163aaff9cd91dc640ba85e263cb1ce46fae51cd"
+dependencies = [
+ "serde",
+ "serde_core",
+]
+
+[[package]]
+name = "send_wrapper"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cd0b0ec5f1c1ca621c432a25813d8d60c88abe6d3e08a3eb9cf37d97a0fe3d73"
 
 [[package]]
 name = "serde"
@@ -6587,6 +8118,15 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "serde-content"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3753ca04f350fa92d00b6146a3555e63c55388c9ef2e11e09bce2ff1c0b509c6"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "serde_core"
 version = "1.0.228"
@@ -6633,7 +8173,7 @@ version = "1.0.149"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "83fc039473c5595ace860d8c4fafa220ff474b3fc6bfdb4293327f1a37e94d86"
 dependencies = [
- "indexmap",
+ "indexmap 2.14.0",
  "itoa",
  "memchr",
  "serde",
@@ -6647,7 +8187,7 @@ version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0e033097bf0d2b59a62b42c18ebbb797503839b26afdda2c4e1415cb6c813540"
 dependencies = [
- "indexmap",
+ "indexmap 2.14.0",
  "itoa",
  "memchr",
  "ryu",
@@ -6695,6 +8235,37 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "serde_with"
+version = "3.19.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f05839ce67618e14a09b286535c0d9c94e85ef25469b0e13cb4f844e5593eb19"
+dependencies = [
+ "base64 0.22.1",
+ "chrono",
+ "hex",
+ "indexmap 1.9.3",
+ "indexmap 2.14.0",
+ "schemars 0.9.0",
+ "schemars 1.2.1",
+ "serde_core",
+ "serde_json",
+ "serde_with_macros",
+ "time",
+]
+
+[[package]]
+name = "serde_with_macros"
+version = "3.19.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cf2ebbe86054f9b45bc3881e865683ccfaccce97b9b4cb53f3039d67f355a334"
+dependencies = [
+ "darling",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.117",
+]
+
 [[package]]
 name = "sha1"
 version = "0.10.6"
@@ -6772,6 +8343,24 @@ dependencies = [
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 ]
 
+[[package]]
+name = "simdutf8"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3a9fe34e3e7a50316060351f37187a3f546bce95496156754b601a5fa71b76e"
+
+[[package]]
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+checksum = "0d585997b0ac10be3c5ee635f1bab02d512760d14b7c468801ac8a01d9ae5f1d"
+dependencies = [
+ "num-bigint",
+ "num-traits",
+ "thiserror 2.0.18",
+ "time",
+]
+
 [[package]]
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 version = "0.2.2"
@@ -6833,6 +8422,21 @@ name = "smallvec"
 version = "1.15.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "67b1b7a3b5fe4f1376887184045fcf45c69e92af734b7aaddc05fb777b6fbd03"
+dependencies = [
+ "serde",
+]
+
+[[package]]
+name = "smartstring"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3fb72c633efbaa2dd666986505016c32c3044395ceaf881518399d2f4127ee29"
+dependencies = [
+ "autocfg",
+ "serde",
+ "static_assertions",
+ "version_check",
+]
 
 [[package]]
 name = "smol"
@@ -6856,6 +8460,15 @@ name = "smol_str"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dd538fb6910ac1099850255cf94a94df6551fbdd602454387d0adb2d1ca6dead"
+dependencies = [
+ "serde",
+]
+
+[[package]]
+name = "snap"
+version = "1.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1b6b67fb9a61334225b5b790716f609cd58395f895b3fe8b328786812a40bc3b"
 
 [[package]]
 name = "snow"
@@ -6894,6 +8507,18 @@ dependencies = [
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 ]
 
+[[package]]
+name = "spade"
+version = "2.15.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9699399fd9349b00b184f5635b074f9ec93afffef30c853f8c875b32c0f8c7fa"
+dependencies = [
+ "hashbrown 0.16.1",
+ "num-traits",
+ "robust",
+ "smallvec",
+]
+
 [[package]]
 name = "spin"
 version = "0.9.8"
@@ -6968,6 +8593,24 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
 
+[[package]]
+name = "static_assertions_next"
+version = "1.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d7beae5182595e9a8b683fa98c4317f956c9a2dec3b9716990d20023cc60c766"
+
+[[package]]
+name = "storekey"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
+ "byteorder",
+ "memchr",
+ "serde",
+ "thiserror 1.0.69",
+]
+
 [[package]]
 name = "streaming-iterator"
 version = "0.1.9"
@@ -6993,6 +8636,31 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "string_cache"
+version = "0.8.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bf776ba3fa74f83bf4b63c3dcbbf82173db2632ed8452cb2d891d33f459de70f"
+dependencies = [
+ "new_debug_unreachable",
+ "parking_lot 0.12.5",
+ "phf_shared",
+ "precomputed-hash",
+ "serde",
+]
+
+[[package]]
+name = "string_cache_codegen"
+version = "0.5.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c711928715f1fe0fe509c53b43e993a9a557babc2d0a3567d0a3006f1ac931a0"
+dependencies = [
+ "phf_generator",
+ "phf_shared",
+ "proc-macro2",
+ "quote",
+]
+
 [[package]]
 name = "strsim"
 version = "0.11.1"
@@ -7048,6 +8716,155 @@ version = "2.6.1"
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 checksum = "13c2bddecc57b384dee18652358fb23172facb8a2c51ccc10d74c157bdea3292"
 
+[[package]]
+name = "surrealdb"
+version = "2.6.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3429154a8b5a98ca39100ba45ef49ae046fb1d0869dff78d78a2670b1b278982"
+dependencies = [
+ "arrayvec",
+ "async-channel 2.5.0",
+ "bincode",
+ "chrono",
+ "dmp",
+ "futures",
+ "geo",
+ "getrandom 0.3.4",
+ "indexmap 2.14.0",
+ "path-clean",
+ "pharos",
+ "reblessive",
+ "revision 0.11.0",
+ "ring",
+ "rust_decimal",
+ "rustls-pki-types",
+ "semver",
+ "serde",
+ "serde-content",
+ "serde_json",
+ "surrealdb-core",
+ "thiserror 1.0.69",
+ "tokio",
+ "tokio-util",
+ "tracing",
+ "url",
+ "uuid",
+ "wasm-bindgen-futures",
+ "wasmtimer",
+ "ws_stream_wasm",
+]
+
+[[package]]
+name = "surrealdb-core"
+version = "2.6.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
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+ "ahash 0.8.12",
+ "ammonia",
+ "any_ascii",
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+ "async-channel 2.5.0",
+ "async-executor",
+ "async-graphql",
+ "base64 0.21.7",
+ "bcrypt",
+ "bincode",
+ "blake3",
+ "bytes",
+ "castaway",
+ "cedar-policy",
+ "chrono",
+ "ciborium",
+ "dashmap",
+ "deunicode",
+ "dmp",
+ "ext-sort",
+ "fst",
+ "futures",
+ "fuzzy-matcher",
+ "geo",
+ "geo-types",
+ "getrandom 0.3.4",
+ "hashbrown 0.14.5",
+ "hex",
+ "http",
+ "ipnet",
+ "jsonwebtoken",
+ "lexicmp",
+ "linfa-linalg",
+ "md-5",
+ "ndarray",
+ "ndarray-stats",
+ "num-traits",
+ "num_cpus",
+ "object_store",
+ "parking_lot 0.12.5",
+ "pbkdf2",
+ "pharos",
+ "phf",
+ "pin-project-lite",
+ "quick_cache 0.5.2",
+ "radix_trie",
+ "rand 0.8.6",
+ "rayon",
+ "reblessive",
+ "regex",
+ "revision 0.11.0",
+ "ring",
+ "rmpv",
+ "roaring",
+ "rust-stemmers",
+ "rust_decimal",
+ "scrypt",
+ "semver",
+ "serde",
+ "serde-content",
+ "serde_json",
+ "sha1",
+ "sha2",
+ "snap",
+ "storekey",
+ "strsim",
+ "subtle",
+ "surrealkv",
+ "sysinfo 0.33.1",
+ "tempfile",
+ "thiserror 1.0.69",
+ "tokio",
+ "tracing",
+ "trice",
+ "ulid",
+ "unicase",
+ "url",
+ "uuid",
+ "vart 0.8.1",
+ "wasm-bindgen-futures",
+ "wasmtimer",
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+ "bytes",
+ "chrono",
+ "crc32fast",
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+ "revision 0.10.0",
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 name = "sval"
 version = "2.19.0"
@@ -7218,6 +9035,20 @@ dependencies = [
  "windows 0.57.0",
 ]
 
+[[package]]
+name = "sysinfo"
+version = "0.33.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4fc858248ea01b66f19d8e8a6d55f41deaf91e9d495246fd01368d99935c6c01"
+dependencies = [
+ "core-foundation-sys",
+ "libc",
+ "memchr",
+ "ntapi",
+ "rayon",
+ "windows 0.57.0",
+]
+
 [[package]]
 name = "system-configuration"
 version = "0.6.1"
@@ -7286,6 +9117,12 @@ dependencies = [
  "objc",
 ]
 
+[[package]]
+name = "tap"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "55937e1799185b12863d447f42597ed69d9928686b8d88a1df17376a097d8369"
+
 [[package]]
 name = "tempfile"
 version = "3.27.0"
@@ -7310,6 +9147,17 @@ dependencies = [
  "utf-8",
 ]
 
+[[package]]
+name = "term"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c59df8ac95d96ff9bede18eb7300b0fda5e5d8d90960e76f8e14ae765eedbf1f"
+dependencies = [
+ "dirs-next",
+ "rustversion",
+ "winapi",
+]
+
 [[package]]
 name = "termcolor"
 version = "1.4.1"
@@ -7319,6 +9167,15 @@ dependencies = [
  "winapi-util",
 ]
 
+[[package]]
+name = "thin-vec"
+version = "0.2.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b0f7e269b48f0a7dd0146680fa24b50cc67fc0373f086a5b2f99bd084639b482"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "thiserror"
 version = "1.0.69"
@@ -7556,7 +9413,7 @@ version = "1.1.2+spec-1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "81f3d15e84cbcd896376e6730314d59fb5a87f31e4b038454184435cd57defee"
 dependencies = [
- "indexmap",
+ "indexmap 2.14.0",
  "serde_core",
  "serde_spanned 1.1.1",
  "toml_datetime 1.1.1+spec-1.1.0",
@@ -7589,7 +9446,7 @@ version = "0.22.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "41fe8c660ae4257887cf66394862d21dbca4a6ddd26f04a3560410406a2f819a"
 dependencies = [
- "indexmap",
+ "indexmap 2.14.0",
  "serde",
  "serde_spanned 0.6.9",
  "toml_datetime 0.6.11",
@@ -7603,7 +9460,7 @@ version = "0.25.11+spec-1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0b59c4d22ed448339746c59b905d24568fcbb3ab65a500494f7b8c3e97739f2b"
 dependencies = [
- "indexmap",
+ "indexmap 2.14.0",
  "toml_datetime 1.1.1+spec-1.1.0",
  "toml_parser",
  "winnow 1.0.2",
@@ -7747,6 +9604,17 @@ dependencies = [
  "tree-sitter-language",
 ]
 
+[[package]]
+name = "trice"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d3aaab10ae9fac0b10f392752bf56f0fd20845f39037fec931e8537b105b515a"
+dependencies = [
+ "js-sys",
+ "wasm-bindgen",
+ "web-sys",
+]
+
 [[package]]
 name = "try-lock"
 version = "0.2.5"
@@ -7786,6 +9654,12 @@ version = "1.20.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "40ce102ab67701b8526c123c1bab5cbe42d7040ccfd0f64af1a385808d2f43de"
 
+[[package]]
+name = "ucd-trie"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2896d95c02a80c6d6a5d6e953d479f5ddf2dfdb6a244441010e373ac0fb88971"
+
 [[package]]
 name = "uds_windows"
 version = "1.2.1"
@@ -7868,6 +9742,15 @@ version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3b09c83c3c29d37506a3e260c08c03743a6bb66a9cd432c6934ab501a190571f"
 
+[[package]]
+name = "unicode-normalization"
+version = "0.1.25"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5fd4f6878c9cb28d874b009da9e8d183b5abc80117c40bbd187a1fde336be6e8"
+dependencies = [
+ "tinyvec",
+]
+
 [[package]]
 name = "unicode-properties"
 version = "0.1.4"
@@ -7880,6 +9763,16 @@ version = "0.5.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "383ad40bb927465ec0ce7720e033cb4ca06912855fc35db31b5755d0de75b1ee"
 
+[[package]]
+name = "unicode-security"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2e4ddba1535dd35ed8b61c52166b7155d7f4e4b8847cec6f48e71dc66d8b5e50"
+dependencies = [
+ "unicode-normalization",
+ "unicode-script",
+]
+
 [[package]]
 name = "unicode-segmentation"
 version = "1.13.2"
@@ -7892,6 +9785,12 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b1d386ff53b415b7fe27b50bb44679e2cc4660272694b7b6f3326d8480823a94"
 
+[[package]]
+name = "unicode-width"
+version = "0.1.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7dd6e30e90baa6f72411720665d41d89b9a3d039dc45b8faea1ddd07f617f6af"
+
 [[package]]
 name = "unicode-width"
 version = "0.2.2"
@@ -7945,13 +9844,19 @@ dependencies = [
  "serde_derive",
 ]
 
+[[package]]
+name = "urlencoding"
+version = "2.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "daf8dba3b7eb870caf1ddeed7bc9d2a049f3cfdfae7cb521b087cc33ae4c49da"
+
 [[package]]
 name = "usvg"
 version = "0.45.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "80be9b06fbae3b8b303400ab20778c80bbaf338f563afe567cf3c9eea17b47ef"
 dependencies = [
- "base64",
+ "base64 0.22.1",
  "data-url",
  "flate2",
  "fontdb 0.23.0",
@@ -8056,6 +9961,18 @@ dependencies = [
  "sval_serde",
 ]
 
+[[package]]
+name = "vart"
+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "87782b74f898179396e93c0efabb38de0d58d50bbd47eae00c71b3a1144dbbae"
+
+[[package]]
+name = "vart"
+version = "0.9.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b1982d899e57d646498709735f16e9224cf1e8680676ad687f930cf8b5b555ae"
+
 [[package]]
 name = "vcpkg"
 version = "0.2.15"
@@ -8146,6 +10063,7 @@ dependencies = [
  "cfg-if",
  "once_cell",
  "rustversion",
+ "serde",
  "wasm-bindgen-macro",
  "wasm-bindgen-shared",
 ]
@@ -8219,7 +10137,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bb0e353e6a2fbdc176932bbaab493762eb1255a7900fe0fea1a2f96c296cc909"
 dependencies = [
  "anyhow",
- "indexmap",
+ "indexmap 2.14.0",
  "wasm-encoder 0.244.0",
  "wasmparser 0.244.0",
 ]
@@ -8288,7 +10206,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d06bfa36ab3ac2be0dee563380147a5b81ba10dd8885d7fbbc9eb574be67d185"
 dependencies = [
  "bitflags 2.11.1",
- "indexmap",
+ "indexmap 2.14.0",
 ]
 
 [[package]]
@@ -8299,7 +10217,7 @@ checksum = "47b807c72e1bac69382b3a6fb3dbe8ea4c0ed87ff5629b8685ae6b9a611028fe"
 dependencies = [
  "bitflags 2.11.1",
  "hashbrown 0.15.5",
- "indexmap",
+ "indexmap 2.14.0",
  "semver",
 ]
 
@@ -8310,10 +10228,23 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "aa4439c5eee9df71ee0c6efb37f63b1fcb1fec38f85f5142c54e7ed05d33091a"
 dependencies = [
  "bitflags 2.11.1",
- "indexmap",
+ "indexmap 2.14.0",
  "semver",
 ]
 
+[[package]]
+name = "wasmtimer"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c7ed9d8b15c7fb594d72bfb4b5a276f3d2029333cd93a932f376f5937f6f80ee"
+dependencies = [
+ "futures",
+ "js-sys",
+ "parking_lot 0.12.5",
+ "pin-utils",
+ "wasm-bindgen",
+]
+
 [[package]]
 name = "wast"
 version = "248.0.0"
@@ -8323,7 +10254,7 @@ dependencies = [
  "bumpalo",
  "leb128fmt",
  "memchr",
- "unicode-width",
+ "unicode-width 0.2.2",
  "wasm-encoder 0.248.0",
 ]
 
@@ -8453,6 +10384,18 @@ dependencies = [
  "wasm-bindgen",
 ]
 
+[[package]]
+name = "web_atoms"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "57ffde1dc01240bdf9992e3205668b235e59421fd085e8a317ed98da0178d414"
+dependencies = [
+ "phf",
+ "phf_codegen",
+ "string_cache",
+ "string_cache_codegen",
+]
+
 [[package]]
 name = "weezl"
 version = "0.1.12"
@@ -9123,7 +11066,7 @@ checksum = "b7c566e0f4b284dd6561c786d9cb0142da491f46a9fbed79ea69cdad5db17f21"
 dependencies = [
  "anyhow",
  "heck 0.5.0",
- "indexmap",
+ "indexmap 2.14.0",
  "prettyplease",
  "syn 2.0.117",
  "wasm-metadata",
@@ -9154,7 +11097,7 @@ checksum = "9d66ea20e9553b30172b5e831994e35fbde2d165325bec84fc43dbf6f4eb9cb2"
 dependencies = [
  "anyhow",
  "bitflags 2.11.1",
- "indexmap",
+ "indexmap 2.14.0",
  "log",
  "serde",
  "serde_derive",
@@ -9173,7 +11116,7 @@ checksum = "ecc8ac4bc1dc3381b7f59c34f00b67e18f910c2c0f50015669dde7def656a736"
 dependencies = [
  "anyhow",
  "id-arena",
- "indexmap",
+ "indexmap 2.14.0",
  "log",
  "semver",
  "serde",
@@ -9189,6 +11132,34 @@ version = "0.6.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1ffae5123b2d3fc086436f8834ae3ab053a283cfac8fe0a0b8eaae044768a4c4"
 
+[[package]]
+name = "ws_stream_wasm"
+version = "0.7.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c173014acad22e83f16403ee360115b38846fe754e735c5d9d3803fe70c6abc"
+dependencies = [
+ "async_io_stream",
+ "futures",
+ "js-sys",
+ "log",
+ "pharos",
+ "rustc_version",
+ "send_wrapper",
+ "thiserror 2.0.18",
+ "wasm-bindgen",
+ "wasm-bindgen-futures",
+ "web-sys",
+]
+
+[[package]]
+name = "wyz"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "05f360fc0b24296329c78fda852a1e9ae82de9cf7b27dae4b7f62f118f77b9ed"
+dependencies = [
+ "tap",
+]
+
 [[package]]
 name = "x11"
 version = "2.21.0"
@@ -9768,7 +11739,7 @@ version = "0.12.15-zed"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ac2d05756ff48539950c3282ad7acf3817ad3f08797c205ad1c34a2ce03b9970"
 dependencies = [
- "base64",
+ "base64 0.22.1",
  "bytes",
  "encoding_rs",
  "futures-core",
@@ -9826,7 +11797,7 @@ dependencies = [
  "rand 0.8.6",
  "screencapturekit",
  "screencapturekit-sys",
- "sysinfo",
+ "sysinfo 0.31.4",
  "tao-core-video-sys",
  "windows 0.61.3",
  "windows-capture",
@@ -9840,7 +11811,7 @@ version = "0.4.0-zed"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0c0b46ed118eba34d9ba53d94ddc0b665e0e06a2cf874cfa2dd5dec278148642"
 dependencies = [
- "ahash",
+ "ahash 0.8.12",
  "hashbrown 0.14.5",
  "log",
  "x11rb",
diff --git a/Cargo.toml b/Cargo.toml
index a8ca317..196b0d2 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -53,6 +53,11 @@ members = [
     "crates/modules/ui_engine/widgets/tiled",
     "crates/modules/ui_engine/widgets/text_input",
 
+    # ============================================================
+    # modules/nakui/ — ERP matemático (nakui absorbido)
+    # ============================================================
+    "crates/modules/nakui/core",
+
     # ============================================================
     # apps/ — apps que consumen el protocolo (yahweh modules+shell)
     # ============================================================
diff --git a/crates/modules/nakui/core/Cargo.toml b/crates/modules/nakui/core/Cargo.toml
new file mode 100644
index 0000000..3d4b869
--- /dev/null
+++ b/crates/modules/nakui/core/Cargo.toml
@@ -0,0 +1,38 @@
+[package]
+name = "nakui-core"
+version = "0.1.0"
+edition = "2021"
+
+[features]
+default = []
+# Pulls in surrealdb's pure-Rust SurrealKV backend so SurrealStore can
+# persist to disk across process restarts. Lighter compile cost than
+# RocksDB (which would otherwise pull in a C++ build); opt-in only.
+persistent = ["surrealdb/kv-surrealkv"]
+
+[dependencies]
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+rhai = { version = "1.20", features = ["serde"] }
+uuid = { version = "1", features = ["v4", "serde"] }
+thiserror = "1"
+petgraph = "0.6"
+sha2 = "0.10"
+surrealdb = { version = "2", default-features = false, features = ["kv-mem"] }
+tokio = { version = "1", features = ["rt", "macros"] }
+
+[[bin]]
+name = "nakui"
+path = "src/bin/nakui.rs"
+
+[[bin]]
+name = "demo"
+path = "src/bin/demo.rs"
+
+[[bin]]
+name = "inventory_demo"
+path = "src/bin/inventory_demo.rs"
+
+[[bin]]
+name = "sales_demo"
+path = "src/bin/sales_demo.rs"
diff --git a/crates/modules/nakui/core/src/bin/demo.rs b/crates/modules/nakui/core/src/bin/demo.rs
new file mode 100644
index 0000000..93c9254
--- /dev/null
+++ b/crates/modules/nakui/core/src/bin/demo.rs
@@ -0,0 +1,224 @@
+use nakui_core::event_log::{
+    EventLog, ExecuteError, execute_and_log, replay, seed_and_log, verify_log,
+};
+use nakui_core::executor::Executor;
+use nakui_core::store::{MemoryStore, Store};
+use serde_json::json;
+use uuid::Uuid;
+
+fn main() {
+    let module_dir =
+        std::env::var("NAKUI_MODULE").unwrap_or_else(|_| "modules/treasury".into());
+    let exec = Executor::load_module(&module_dir).expect("load module");
+
+    let log_path = std::env::temp_dir().join(format!("nakui_demo_{}.jsonl", Uuid::new_v4()));
+    let mut log = EventLog::open(&log_path).expect("open log");
+    let mut store = MemoryStore::new();
+
+    let caja_a = Uuid::new_v4();
+    let caja_b = Uuid::new_v4();
+    let caja_c = Uuid::new_v4();
+    seed_and_log(
+        &exec,
+        &mut store,
+        &mut log,
+        "Caja",
+        caja_a,
+        json!({
+            "id": caja_a.to_string(),
+            "name": "Caja Principal",
+            "saldo": 200_000_i64,
+            "currency": "USD",
+        }),
+    )
+    .expect("seed A");
+    seed_and_log(
+        &exec,
+        &mut store,
+        &mut log,
+        "Caja",
+        caja_b,
+        json!({
+            "id": caja_b.to_string(),
+            "name": "Caja Chica",
+            "saldo": 50_000_i64,
+            "currency": "USD",
+        }),
+    )
+    .expect("seed B");
+    seed_and_log(
+        &exec,
+        &mut store,
+        &mut log,
+        "Caja",
+        caja_c,
+        json!({
+            "id": caja_c.to_string(),
+            "name": "Caja EUR",
+            "saldo": 30_000_i64,
+            "currency": "EUR",
+        }),
+    )
+    .expect("seed C");
+
+    section("== seed ==");
+    print_caja(&store, "A", caja_a);
+    print_caja(&store, "B", caja_b);
+    print_caja(&store, "C", caja_c);
+
+    section("== A: deposit 50_000 USD ==");
+    run_and_report(
+        &exec,
+        &mut store,
+        &mut log,
+        "register_cash_move",
+        &[("caja", caja_a)],
+        json!({
+            "monto": 50_000_i64,
+            "tipo": "in",
+            "timestamp": "2026-05-04T12:00:00Z",
+            "memo": "deposito A",
+            "movimiento_id": Uuid::new_v4().to_string(),
+        }),
+    );
+    print_caja(&store, "A", caja_a);
+
+    section("== transfer A -> B 100_000 USD ==");
+    run_and_report(
+        &exec,
+        &mut store,
+        &mut log,
+        "transfer_between_cajas",
+        &[("source", caja_a), ("dest", caja_b)],
+        json!({
+            "monto": 100_000_i64,
+            "timestamp": "2026-05-04T12:30:00Z",
+            "memo": "transferencia operativa",
+            "transfer_id": Uuid::new_v4().to_string(),
+        }),
+    );
+    print_caja(&store, "A", caja_a);
+    print_caja(&store, "B", caja_b);
+
+    section("== transfer A -> B 999_999_999 USD (reject: post-check on source) ==");
+    run_and_report(
+        &exec,
+        &mut store,
+        &mut log,
+        "transfer_between_cajas",
+        &[("source", caja_a), ("dest", caja_b)],
+        json!({
+            "monto": 999_999_999_i64,
+            "timestamp": "2026-05-04T13:00:00Z",
+            "memo": "overdraw",
+            "transfer_id": Uuid::new_v4().to_string(),
+        }),
+    );
+
+    section("== transfer A(USD) -> C(EUR) (reject: rhai throws) ==");
+    run_and_report(
+        &exec,
+        &mut store,
+        &mut log,
+        "transfer_between_cajas",
+        &[("source", caja_a), ("dest", caja_c)],
+        json!({
+            "monto": 10_000_i64,
+            "timestamp": "2026-05-04T14:00:00Z",
+            "memo": "USD -> EUR",
+            "transfer_id": Uuid::new_v4().to_string(),
+        }),
+    );
+
+    section("== self-transfer A -> A (reject: DuplicateInputId) ==");
+    run_and_report(
+        &exec,
+        &mut store,
+        &mut log,
+        "transfer_between_cajas",
+        &[("source", caja_a), ("dest", caja_a)],
+        json!({
+            "monto": 1_000_i64,
+            "timestamp": "2026-05-04T15:00:00Z",
+            "memo": "self",
+            "transfer_id": Uuid::new_v4().to_string(),
+        }),
+    );
+
+    section("== final live state ==");
+    print_caja(&store, "A", caja_a);
+    print_caja(&store, "B", caja_b);
+    print_caja(&store, "C", caja_c);
+
+    let entries = log.entries().expect("read log");
+    section(&format!(
+        "== log: {} entries at {} ==",
+        entries.len(),
+        log.path().display()
+    ));
+    for e in &entries {
+        match e {
+            nakui_core::event_log::LogEntry::Seed {
+                seq, entity, id, ..
+            } => println!("  #{:02} seed   {} {}", seq, entity, id),
+            nakui_core::event_log::LogEntry::Morphism {
+                seq,
+                morphism,
+                ops,
+                ..
+            } => println!("  #{:02} morph  {} ({} ops)", seq, morphism, ops.len()),
+        }
+    }
+
+    section("== replay verification (state) ==");
+    let replayed = replay(&log).expect("replay");
+    if store == replayed {
+        println!("  ok: replayed store byte-equal to live store");
+    } else {
+        println!("  MISMATCH: replay diverges from live");
+    }
+
+    section("== determinism verification (ops) ==");
+    match verify_log(&log, &exec) {
+        Ok(()) => println!(
+            "  ok: every logged morphism reproduced its ops on re-execution"
+        ),
+        Err(e) => println!("  nondeterminism detected: {}", e),
+    }
+
+    if std::env::var_os("NAKUI_DEMO_KEEP").is_none() {
+        let _ = std::fs::remove_file(&log_path);
+    } else {
+        println!("\n(NAKUI_DEMO_KEEP set — keeping log at {})", log_path.display());
+    }
+}
+
+fn run_and_report(
+    exec: &Executor,
+    store: &mut MemoryStore,
+    log: &mut EventLog,
+    morphism: &str,
+    inputs: &[(&str, Uuid)],
+    params: serde_json::Value,
+) {
+    match execute_and_log(exec, store, log, morphism, inputs, params) {
+        Ok(ops) => println!("  ok ({} ops, logged at #{})", ops.len(), log.next_seq() - 1),
+        Err(ExecuteError::PreLog(e)) => println!("  rejected: {}", e),
+        Err(ExecuteError::LogAppend(e)) => println!("  LOG APPEND FAILED: {}", e),
+        Err(ExecuteError::PostLogStore(e)) => println!(
+            "  POST-LOG STORE FAILED (log is canonical, store stale): {}",
+            e
+        ),
+    }
+}
+
+fn print_caja(store: &MemoryStore, label: &str, id: Uuid) {
+    let v = store.load("Caja", id).expect("caja exists");
+    let saldo = v.get("saldo").and_then(|v| v.as_i64()).unwrap_or(0);
+    let currency = v.get("currency").and_then(|v| v.as_str()).unwrap_or("?");
+    println!("  {} {}: saldo={} {}", label, id, saldo, currency);
+}
+
+fn section(title: &str) {
+    println!("\n{}", title);
+}
diff --git a/crates/modules/nakui/core/src/bin/inventory_demo.rs b/crates/modules/nakui/core/src/bin/inventory_demo.rs
new file mode 100644
index 0000000..606a556
--- /dev/null
+++ b/crates/modules/nakui/core/src/bin/inventory_demo.rs
@@ -0,0 +1,170 @@
+use nakui_core::event_log::{
+    EventLog, ExecuteError, execute_and_log, replay, seed_and_log, verify_log,
+};
+use nakui_core::executor::Executor;
+use nakui_core::store::{MemoryStore, Store};
+use serde_json::json;
+use uuid::Uuid;
+
+fn main() {
+    let module_dir = std::env::var("NAKUI_MODULE")
+        .unwrap_or_else(|_| "modules/inventory".into());
+    let exec = Executor::load_module(&module_dir).expect("load module");
+
+    let log_path =
+        std::env::temp_dir().join(format!("nakui_inv_{}.jsonl", Uuid::new_v4()));
+    let mut log = EventLog::open(&log_path).expect("open log");
+    let mut store = MemoryStore::new();
+
+    // Two stocks of SKU "kg-cafe-honduras-2026" at warehouses A and B,
+    // plus a third stock of SKU "lt-aceite-girasol" at warehouse C.
+    let stock_a = Uuid::new_v4();
+    let stock_b = Uuid::new_v4();
+    let stock_c = Uuid::new_v4();
+    seed_and_log(
+        &exec,
+        &mut store, &mut log, "Stock", stock_a,
+        json!({
+            "id": stock_a.to_string(),
+            "sku_id": "kg-cafe-honduras-2026",
+            "ubicacion": "almacen-norte",
+            "cantidad": 500_i64,
+        }),
+    ).expect("seed A");
+    seed_and_log(
+        &exec,
+        &mut store, &mut log, "Stock", stock_b,
+        json!({
+            "id": stock_b.to_string(),
+            "sku_id": "kg-cafe-honduras-2026",
+            "ubicacion": "almacen-sur",
+            "cantidad": 100_i64,
+        }),
+    ).expect("seed B");
+    seed_and_log(
+        &exec,
+        &mut store, &mut log, "Stock", stock_c,
+        json!({
+            "id": stock_c.to_string(),
+            "sku_id": "lt-aceite-girasol",
+            "ubicacion": "almacen-sur",
+            "cantidad": 200_i64,
+        }),
+    ).expect("seed C");
+
+    section("== seed ==");
+    print_stock(&store, "A (cafe norte)", stock_a);
+    print_stock(&store, "B (cafe sur)", stock_b);
+    print_stock(&store, "C (aceite sur)", stock_c);
+
+    section("== recibir 250 kg cafe en A ==");
+    run_and_report(&exec, &mut store, &mut log, "recibir_stock",
+        &[("stock", stock_a)],
+        json!({
+            "cantidad": 250_i64,
+            "timestamp": "2026-05-04T08:00:00Z",
+            "movimiento_id": Uuid::new_v4().to_string(),
+        }),
+    );
+    print_stock(&store, "A", stock_a);
+
+    section("== transferir 200 kg cafe A -> B (conserva por sku_id) ==");
+    run_and_report(&exec, &mut store, &mut log, "transferir_stock",
+        &[("source", stock_a), ("dest", stock_b)],
+        json!({
+            "cantidad": 200_i64,
+            "timestamp": "2026-05-04T09:00:00Z",
+            "transfer_id": Uuid::new_v4().to_string(),
+        }),
+    );
+    print_stock(&store, "A", stock_a);
+    print_stock(&store, "B", stock_b);
+
+    section("== transferir 999_999 kg cafe A -> B (reject: stock <= 0) ==");
+    run_and_report(&exec, &mut store, &mut log, "transferir_stock",
+        &[("source", stock_a), ("dest", stock_b)],
+        json!({
+            "cantidad": 999_999_i64,
+            "timestamp": "2026-05-04T10:00:00Z",
+            "transfer_id": Uuid::new_v4().to_string(),
+        }),
+    );
+
+    section("== transferir 50 cafe(A) -> aceite(C) (reject: rhai SKU mismatch) ==");
+    run_and_report(&exec, &mut store, &mut log, "transferir_stock",
+        &[("source", stock_a), ("dest", stock_c)],
+        json!({
+            "cantidad": 50_i64,
+            "timestamp": "2026-05-04T11:00:00Z",
+            "transfer_id": Uuid::new_v4().to_string(),
+        }),
+    );
+
+    section("== final live state ==");
+    print_stock(&store, "A", stock_a);
+    print_stock(&store, "B", stock_b);
+    print_stock(&store, "C", stock_c);
+
+    let entries = log.entries().expect("read log");
+    section(&format!(
+        "== log: {} entries at {} ==",
+        entries.len(),
+        log.path().display()
+    ));
+    for e in &entries {
+        match e {
+            nakui_core::event_log::LogEntry::Seed { seq, entity, id, .. } =>
+                println!("  #{:02} seed   {} {}", seq, entity, id),
+            nakui_core::event_log::LogEntry::Morphism { seq, morphism, ops, .. } =>
+                println!("  #{:02} morph  {} ({} ops)", seq, morphism, ops.len()),
+        }
+    }
+
+    section("== replay verification (state) ==");
+    let replayed = replay(&log).expect("replay");
+    if store == replayed {
+        println!("  ok: replayed store byte-equal to live store");
+    } else {
+        println!("  MISMATCH");
+    }
+
+    section("== determinism verification (ops) ==");
+    match verify_log(&log, &exec) {
+        Ok(()) => println!(
+            "  ok: every logged morphism reproduced its ops on re-execution"
+        ),
+        Err(e) => println!("  nondeterminism detected: {}", e),
+    }
+
+    let _ = std::fs::remove_file(&log_path);
+}
+
+fn run_and_report(
+    exec: &Executor,
+    store: &mut MemoryStore,
+    log: &mut EventLog,
+    morphism: &str,
+    inputs: &[(&str, Uuid)],
+    params: serde_json::Value,
+) {
+    match execute_and_log(exec, store, log, morphism, inputs, params) {
+        Ok(ops) => println!("  ok ({} ops, logged at #{})", ops.len(), log.next_seq() - 1),
+        Err(ExecuteError::PreLog(e)) => println!("  rejected: {}", e),
+        Err(ExecuteError::LogAppend(e)) => println!("  LOG APPEND FAILED: {}", e),
+        Err(ExecuteError::PostLogStore(e)) => println!(
+            "  POST-LOG STORE FAILED (log canonical, store stale): {}", e
+        ),
+    }
+}
+
+fn print_stock(store: &MemoryStore, label: &str, id: Uuid) {
+    let v = store.load("Stock", id).expect("stock exists");
+    let cantidad = v.get("cantidad").and_then(|v| v.as_i64()).unwrap_or(0);
+    let sku = v.get("sku_id").and_then(|v| v.as_str()).unwrap_or("?");
+    let loc = v.get("ubicacion").and_then(|v| v.as_str()).unwrap_or("?");
+    println!("  {}: cantidad={} sku={} ubic={}", label, cantidad, sku, loc);
+}
+
+fn section(title: &str) {
+    println!("\n{}", title);
+}
diff --git a/crates/modules/nakui/core/src/bin/nakui.rs b/crates/modules/nakui/core/src/bin/nakui.rs
new file mode 100644
index 0000000..6ee5714
--- /dev/null
+++ b/crates/modules/nakui/core/src/bin/nakui.rs
@@ -0,0 +1,455 @@
+//! `nakui` — operator CLI for inspecting, replaying, and verifying an
+//! event log produced by the kernel. The three subcommands map to the
+//! three things you need when something goes sideways in production:
+//!
+//!   - `inspect`     — what's in the log? (audit trail)
+//!   - `replay`      — what state does the log produce? (recovery dry-run)
+//!   - `verify-log`  — does every morphism still reproduce its ops?
+//!                     (determinism contract — the regression alarm)
+//!
+//! Exit codes: 0 on success, 1 on operational error, 2 on bad arguments.
+
+use std::collections::BTreeMap;
+use std::path::PathBuf;
+use std::process::ExitCode;
+
+use nakui_core::drift::{DriftDiff, check_against_socket};
+use nakui_core::event_log::{
+    EventLog, LogEntry, Snapshot, replay_with_snapshot_into, verify_log,
+};
+use nakui_core::executor::Executor;
+use nakui_core::run::run_server;
+use nakui_core::store::MemoryStore;
+
+fn main() -> ExitCode {
+    let args: Vec<String> = std::env::args().collect();
+    let prog = args.first().cloned().unwrap_or_else(|| "nakui".into());
+    let sub = match args.get(1).map(String::as_str) {
+        Some(s) => s,
+        None => {
+            print_usage(&prog);
+            return ExitCode::from(2);
+        }
+    };
+    let rest = &args[2..];
+
+    let result = match sub {
+        "inspect" => cmd_inspect(rest),
+        "replay" => cmd_replay(rest),
+        "verify-log" => cmd_verify_log(rest),
+        "run" => cmd_run(rest),
+        "drift" => cmd_drift(rest),
+        "snapshot" => cmd_snapshot(rest),
+        "compact" => cmd_compact(rest),
+        "-h" | "--help" | "help" => {
+            print_usage(&prog);
+            return ExitCode::SUCCESS;
+        }
+        other => {
+            eprintln!("nakui: unknown subcommand `{}`", other);
+            print_usage(&prog);
+            return ExitCode::from(2);
+        }
+    };
+
+    match result {
+        Ok(()) => ExitCode::SUCCESS,
+        Err(CliError::BadArgs(msg)) => {
+            eprintln!("nakui: {}", msg);
+            print_usage(&prog);
+            ExitCode::from(2)
+        }
+        Err(CliError::Op(msg)) => {
+            eprintln!("nakui: {}", msg);
+            ExitCode::from(1)
+        }
+        // Drift uses its own exit code so callers can distinguish "the
+        // tool failed" (1) from "the tool worked and detected drift" (3).
+        Err(CliError::DriftDetected) => ExitCode::from(3),
+    }
+}
+
+enum CliError {
+    BadArgs(String),
+    Op(String),
+    DriftDetected,
+}
+
+fn print_usage(prog: &str) {
+    eprintln!(
+        "usage:
+  {p} inspect    --log <path>
+  {p} replay     --log <path> [--snapshot <path>]
+  {p} verify-log --log <path> --module <dir>
+  {p} run        --log <path> --module <dir> --socket <path>
+                 [--snapshot <path>] [--store-path <dir>]
+  {p} drift      --log <path> --against <socket>
+  {p} snapshot   --log <path> --module <dir> --out <path>
+  {p} compact    --log <path> --snapshot <path>
+
+  --store-path activates persistent SurrealStore (kv-surrealkv);
+  requires the binary to be built with `--features persistent`.",
+        p = prog
+    );
+}
+
+/// Minimal flag parser: `--name value` pairs, no `=` form, no clustering.
+/// Returns a map of name -> value. Unknown flags are an error so typos
+/// surface immediately instead of silently being ignored.
+fn parse_flags(args: &[String], allowed: &[&str]) -> Result<BTreeMap<String, String>, CliError> {
+    let mut out = BTreeMap::new();
+    let mut i = 0;
+    while i < args.len() {
+        let flag = &args[i];
+        if !flag.starts_with("--") {
+            return Err(CliError::BadArgs(format!(
+                "expected --flag, got `{}`",
+                flag
+            )));
+        }
+        let name = &flag[2..];
+        if !allowed.contains(&name) {
+            return Err(CliError::BadArgs(format!("unknown flag `--{}`", name)));
+        }
+        let val = args.get(i + 1).ok_or_else(|| {
+            CliError::BadArgs(format!("flag `--{}` requires a value", name))
+        })?;
+        out.insert(name.to_string(), val.clone());
+        i += 2;
+    }
+    Ok(out)
+}
+
+fn require<'a>(
+    flags: &'a BTreeMap<String, String>,
+    name: &str,
+) -> Result<&'a String, CliError> {
+    flags
+        .get(name)
+        .ok_or_else(|| CliError::BadArgs(format!("missing required flag `--{}`", name)))
+}
+
+fn cmd_inspect(args: &[String]) -> Result<(), CliError> {
+    let flags = parse_flags(args, &["log"])?;
+    let log_path = PathBuf::from(require(&flags, "log")?);
+    let log = EventLog::open(&log_path).map_err(|e| CliError::Op(format!("open log: {}", e)))?;
+    let entries = log
+        .entries()
+        .map_err(|e| CliError::Op(format!("read log: {}", e)))?;
+    println!("log: {}", log.path().display());
+    println!("entries: {}", entries.len());
+    if entries.is_empty() {
+        return Ok(());
+    }
+    println!("seq range: {}..={}", entries[0].seq(), entries.last().unwrap().seq());
+    println!();
+    for e in &entries {
+        match e {
+            LogEntry::Seed {
+                seq, entity, id, ..
+            } => println!("  #{:04} seed   {} {}", seq, entity, id),
+            LogEntry::Morphism {
+                seq,
+                morphism,
+                ops,
+                inputs,
+                ..
+            } => {
+                let inputs_s = inputs
+                    .iter()
+                    .map(|(k, v)| format!("{}={}", k, v))
+                    .collect::<Vec<_>>()
+                    .join(", ");
+                println!(
+                    "  #{:04} morph  {} ({} ops) [{}]",
+                    seq,
+                    morphism,
+                    ops.len(),
+                    inputs_s
+                );
+            }
+        }
+    }
+    Ok(())
+}
+
+fn cmd_replay(args: &[String]) -> Result<(), CliError> {
+    let flags = parse_flags(args, &["log", "snapshot"])?;
+    let log_path = PathBuf::from(require(&flags, "log")?);
+    let log = EventLog::open(&log_path).map_err(|e| CliError::Op(format!("open log: {}", e)))?;
+
+    let snapshot = if let Some(p) = flags.get("snapshot") {
+        let path = PathBuf::from(p);
+        Snapshot::load(&path)
+            .map_err(|e| CliError::Op(format!("load snapshot: {}", e)))?
+            .ok_or_else(|| CliError::Op(format!("snapshot not found: {}", path.display())))?
+            .into()
+    } else {
+        None::<Snapshot>
+    };
+
+    let mut store = MemoryStore::new();
+    replay_with_snapshot_into(&log, snapshot.as_ref(), &mut store)
+        .map_err(|e| CliError::Op(format!("replay: {}", e)))?;
+
+    let entries = log
+        .entries()
+        .map_err(|e| CliError::Op(format!("read log: {}", e)))?;
+    let last_seq = entries.last().map(|e| e.seq().to_string()).unwrap_or_else(|| "<empty>".into());
+    println!("replayed log: {}", log.path().display());
+    if let Some(snap) = &snapshot {
+        println!("snapshot: seq {} (covers seq <= {})", snap.seq, snap.seq);
+    }
+    println!("last seq: {}", last_seq);
+    println!("entities:");
+    let mut by_entity: Vec<(&String, usize)> = store
+        .records()
+        .iter()
+        .map(|(k, v)| (k, v.len()))
+        .collect();
+    by_entity.sort_by(|a, b| a.0.cmp(b.0));
+    if by_entity.is_empty() {
+        println!("  (none)");
+    } else {
+        for (entity, count) in by_entity {
+            println!("  {:<20} {}", entity, count);
+        }
+    }
+    Ok(())
+}
+
+fn cmd_drift(args: &[String]) -> Result<(), CliError> {
+    let flags = parse_flags(args, &["log", "against"])?;
+    let log_path = PathBuf::from(require(&flags, "log")?);
+    let socket_path = PathBuf::from(require(&flags, "against")?);
+
+    let report = check_against_socket(&log_path, &socket_path)
+        .map_err(|e| CliError::Op(format!("drift check: {}", e)))?;
+
+    let log_hex = hex_encode(&report.log_hash);
+    let server_hex = hex_encode(&report.server_hash);
+    if report.in_sync() {
+        println!(
+            "ok: in sync (hash {}, {} records)",
+            short_hash(&log_hex),
+            report.log_records
+        );
+        return Ok(());
+    }
+
+    println!("DRIFT detected");
+    println!(
+        "  log replay:    hash {} ({} records)",
+        log_hex, report.log_records
+    );
+    println!(
+        "  server state:  hash {} ({} records)",
+        server_hex, report.server_records
+    );
+    println!();
+    println!("diffs:");
+    for d in &report.diffs {
+        match d {
+            DriftDiff::OnlyOnServer { entity, id, .. } => {
+                println!("  + {} {} (only on server)", entity, id);
+            }
+            DriftDiff::OnlyInLog { entity, id, .. } => {
+                println!("  - {} {} (only in log replay)", entity, id);
+            }
+            DriftDiff::Tampered {
+                entity,
+                id,
+                log_value,
+                server_value,
+            } => {
+                println!(
+                    "  ~ {} {} (tampered)\n      log:    {}\n      server: {}",
+                    entity, id, log_value, server_value
+                );
+            }
+        }
+    }
+    Err(CliError::DriftDetected)
+}
+
+fn hex_encode(bytes: &[u8]) -> String {
+    const HEX: &[u8; 16] = b"0123456789abcdef";
+    let mut out = String::with_capacity(bytes.len() * 2);
+    for &b in bytes {
+        out.push(HEX[(b >> 4) as usize] as char);
+        out.push(HEX[(b & 0x0f) as usize] as char);
+    }
+    out
+}
+
+fn short_hash(hex: &str) -> String {
+    if hex.len() <= 12 {
+        hex.to_string()
+    } else {
+        format!("{}…{}", &hex[..6], &hex[hex.len() - 4..])
+    }
+}
+
+fn cmd_run(args: &[String]) -> Result<(), CliError> {
+    let flags = parse_flags(args, &["log", "module", "socket", "snapshot", "store-path"])?;
+    let log_path = PathBuf::from(require(&flags, "log")?);
+    let module_dir = PathBuf::from(require(&flags, "module")?);
+    let socket_path = PathBuf::from(require(&flags, "socket")?);
+    let snapshot_path = flags.get("snapshot").map(PathBuf::from);
+    let store_path = flags.get("store-path").map(PathBuf::from);
+
+    eprintln!(
+        "nakui run: module={} log={} socket={} snapshot={} store={}",
+        module_dir.display(),
+        log_path.display(),
+        socket_path.display(),
+        snapshot_path
+            .as_ref()
+            .map(|p| p.display().to_string())
+            .unwrap_or_else(|| "<none>".into()),
+        store_path
+            .as_ref()
+            .map(|p| p.display().to_string())
+            .unwrap_or_else(|| "<memory>".into()),
+    );
+
+    let executor = Executor::load_module(&module_dir)
+        .map_err(|e| CliError::Op(format!("load module {}: {}", module_dir.display(), e)))?;
+    let log = EventLog::open(&log_path).map_err(|e| CliError::Op(format!("open log: {}", e)))?;
+    let snapshot = match &snapshot_path {
+        Some(p) => Some(
+            Snapshot::load(p)
+                .map_err(|e| CliError::Op(format!("load snapshot: {}", e)))?
+                .ok_or_else(|| {
+                    CliError::Op(format!("snapshot file does not exist: {}", p.display()))
+                })?,
+        ),
+        None => None,
+    };
+
+    if let Some(p) = store_path {
+        run_persistent(executor, log, snapshot, &socket_path, &p)
+    } else {
+        let store = MemoryStore::new();
+        run_server(executor, log, store, snapshot, &socket_path)
+            .map_err(|e| CliError::Op(format!("run: {}", e)))
+    }
+}
+
+#[cfg(feature = "persistent")]
+fn run_persistent(
+    executor: Executor,
+    log: EventLog,
+    snapshot: Option<Snapshot>,
+    socket_path: &std::path::Path,
+    store_path: &std::path::Path,
+) -> Result<(), CliError> {
+    use nakui_core::surreal_store::SurrealStore;
+    let store = SurrealStore::new_persistent(store_path).map_err(|e| {
+        CliError::Op(format!(
+            "open persistent store at {}: {}",
+            store_path.display(),
+            e
+        ))
+    })?;
+    run_server(executor, log, store, snapshot, socket_path)
+        .map_err(|e| CliError::Op(format!("run: {}", e)))
+}
+
+#[cfg(not(feature = "persistent"))]
+fn run_persistent(
+    _executor: Executor,
+    _log: EventLog,
+    _snapshot: Option<Snapshot>,
+    _socket_path: &std::path::Path,
+    _store_path: &std::path::Path,
+) -> Result<(), CliError> {
+    Err(CliError::Op(
+        "--store-path requires building with `--features persistent`".into(),
+    ))
+}
+
+fn cmd_snapshot(args: &[String]) -> Result<(), CliError> {
+    let flags = parse_flags(args, &["log", "module", "out"])?;
+    let log_path = PathBuf::from(require(&flags, "log")?);
+    let module_dir = PathBuf::from(require(&flags, "module")?);
+    let out_path = PathBuf::from(require(&flags, "out")?);
+
+    let exec = Executor::load_module(&module_dir)
+        .map_err(|e| CliError::Op(format!("load module {}: {}", module_dir.display(), e)))?;
+    let log = EventLog::open(&log_path).map_err(|e| CliError::Op(format!("open log: {}", e)))?;
+    let mut store = MemoryStore::new();
+    replay_with_snapshot_into(&log, None, &mut store)
+        .map_err(|e| CliError::Op(format!("replay: {}", e)))?;
+    let last_seq = log
+        .entries()
+        .map_err(|e| CliError::Op(format!("read log: {}", e)))?
+        .last()
+        .map(|e| e.seq())
+        .ok_or_else(|| CliError::Op("log is empty; nothing to snapshot".into()))?;
+    let snap = Snapshot::capture(&store, last_seq, &exec);
+    snap.write(&out_path)
+        .map_err(|e| CliError::Op(format!("write snapshot: {}", e)))?;
+
+    let entity_count: usize = store.records().values().map(|m| m.len()).sum();
+    println!(
+        "snapshot written to {} (seq {}, {} records, schema {})",
+        out_path.display(),
+        last_seq,
+        entity_count,
+        short_hash(&hex_encode(&exec.module_schema_hash())),
+    );
+    Ok(())
+}
+
+fn cmd_compact(args: &[String]) -> Result<(), CliError> {
+    let flags = parse_flags(args, &["log", "snapshot"])?;
+    let log_path = PathBuf::from(require(&flags, "log")?);
+    let snap_path = PathBuf::from(require(&flags, "snapshot")?);
+
+    let snap = Snapshot::load(&snap_path)
+        .map_err(|e| CliError::Op(format!("load snapshot: {}", e)))?
+        .ok_or_else(|| CliError::Op(format!("snapshot not found: {}", snap_path.display())))?;
+    let mut log = EventLog::open(&log_path).map_err(|e| CliError::Op(format!("open log: {}", e)))?;
+    let before = log
+        .entries()
+        .map(|es| es.len())
+        .map_err(|e| CliError::Op(format!("read log: {}", e)))?;
+    log.compact_through(snap.seq)
+        .map_err(|e| CliError::Op(format!("compact: {}", e)))?;
+    let after = log
+        .entries()
+        .map(|es| es.len())
+        .map_err(|e| CliError::Op(format!("read log: {}", e)))?;
+    println!(
+        "compacted {} through seq {} ({} → {} entries; {} dropped)",
+        log_path.display(),
+        snap.seq,
+        before,
+        after,
+        before.saturating_sub(after),
+    );
+    Ok(())
+}
+
+fn cmd_verify_log(args: &[String]) -> Result<(), CliError> {
+    let flags = parse_flags(args, &["log", "module"])?;
+    let log_path = PathBuf::from(require(&flags, "log")?);
+    let module_dir = PathBuf::from(require(&flags, "module")?);
+
+    let exec = Executor::load_module(&module_dir)
+        .map_err(|e| CliError::Op(format!("load module {}: {}", module_dir.display(), e)))?;
+    let log = EventLog::open(&log_path).map_err(|e| CliError::Op(format!("open log: {}", e)))?;
+
+    match verify_log(&log, &exec) {
+        Ok(()) => {
+            let n = log
+                .entries()
+                .map(|es| es.len())
+                .map_err(|e| CliError::Op(format!("read log: {}", e)))?;
+            println!("ok: {} entries; every morphism reproduced its ops", n);
+            Ok(())
+        }
+        Err(e) => Err(CliError::Op(format!("verify failed: {}", e))),
+    }
+}
diff --git a/crates/modules/nakui/core/src/bin/sales_demo.rs b/crates/modules/nakui/core/src/bin/sales_demo.rs
new file mode 100644
index 0000000..d7a3946
--- /dev/null
+++ b/crates/modules/nakui/core/src/bin/sales_demo.rs
@@ -0,0 +1,176 @@
+//! Cross-module demo: a `vender` morphism that touches a Stock entity
+//! (defined in inventory's schema) and a Caja entity (defined in
+//! treasury's schema). The sales module's `nsmc.json` lists three schema
+//! files; the executor concatenates them at load time so KCL validates
+//! against all three.
+
+use nakui_core::event_log::{
+    EventLog, ExecuteError, execute_and_log, replay, seed_and_log, verify_log,
+};
+use nakui_core::executor::Executor;
+use nakui_core::store::{MemoryStore, Store};
+use serde_json::json;
+use uuid::Uuid;
+
+fn main() {
+    let module_dir = std::env::var("NAKUI_MODULE")
+        .unwrap_or_else(|_| "modules/sales".into());
+    let exec = Executor::load_module(&module_dir).expect("load module");
+
+    let log_path =
+        std::env::temp_dir().join(format!("nakui_sales_{}.jsonl", Uuid::new_v4()));
+    let mut log = EventLog::open(&log_path).expect("open log");
+    let mut store = MemoryStore::new();
+
+    let stock_id = Uuid::new_v4();
+    let caja_id = Uuid::new_v4();
+    seed_and_log(
+        &exec,
+        &mut store, &mut log, "Stock", stock_id,
+        json!({
+            "id": stock_id.to_string(),
+            "sku_id": "kg-cafe-honduras-2026",
+            "ubicacion": "almacen-norte",
+            "cantidad": 500_i64,
+        }),
+    ).expect("seed stock");
+    seed_and_log(
+        &exec,
+        &mut store, &mut log, "Caja", caja_id,
+        json!({
+            "id": caja_id.to_string(),
+            "name": "Caja Principal",
+            "saldo": 1_000_000_i64,  // $10_000.00 in cents
+            "currency": "USD",
+        }),
+    ).expect("seed caja");
+
+    section("== seed ==");
+    print_stock(&store, "stock", stock_id);
+    print_caja(&store, "caja", caja_id);
+
+    // 1. Sell 100 kg cafe at $50.00 / kg = $5000.00 total.
+    section("== vender 100 kg @ $50.00 c/u ==");
+    run_and_report(&exec, &mut store, &mut log, "vender",
+        &[("stock", stock_id), ("caja", caja_id)],
+        json!({
+            "cantidad": 100_i64,
+            "precio_unitario": 5_000_i64,    // $50.00 in cents
+            "timestamp": "2026-05-04T10:00:00Z",
+            "venta_id": Uuid::new_v4().to_string(),
+        }),
+    );
+    print_stock(&store, "stock", stock_id);
+    print_caja(&store, "caja", caja_id);
+
+    // 2. Try selling more than available stock — should fail Stock post-check.
+    section("== vender 9999 kg (reject: stock <= 0) ==");
+    run_and_report(&exec, &mut store, &mut log, "vender",
+        &[("stock", stock_id), ("caja", caja_id)],
+        json!({
+            "cantidad": 9999_i64,
+            "precio_unitario": 1_000_i64,
+            "timestamp": "2026-05-04T11:00:00Z",
+            "venta_id": Uuid::new_v4().to_string(),
+        }),
+    );
+
+    // 3. Negative price — caught by Rhai.
+    section("== vender con precio negativo (reject: rhai throw) ==");
+    run_and_report(&exec, &mut store, &mut log, "vender",
+        &[("stock", stock_id), ("caja", caja_id)],
+        json!({
+            "cantidad": 10_i64,
+            "precio_unitario": -100_i64,
+            "timestamp": "2026-05-04T11:30:00Z",
+            "venta_id": Uuid::new_v4().to_string(),
+        }),
+    );
+
+    // 4. Another good sale.
+    section("== vender 50 kg @ $60.00 c/u ==");
+    run_and_report(&exec, &mut store, &mut log, "vender",
+        &[("stock", stock_id), ("caja", caja_id)],
+        json!({
+            "cantidad": 50_i64,
+            "precio_unitario": 6_000_i64,
+            "timestamp": "2026-05-04T12:00:00Z",
+            "venta_id": Uuid::new_v4().to_string(),
+        }),
+    );
+    print_stock(&store, "stock", stock_id);
+    print_caja(&store, "caja", caja_id);
+
+    section("== final live state ==");
+    print_stock(&store, "stock", stock_id);
+    print_caja(&store, "caja", caja_id);
+
+    let entries = log.entries().expect("read log");
+    section(&format!(
+        "== log: {} entries at {} ==",
+        entries.len(),
+        log.path().display()
+    ));
+    for e in &entries {
+        match e {
+            nakui_core::event_log::LogEntry::Seed { seq, entity, id, .. } =>
+                println!("  #{:02} seed   {} {}", seq, entity, id),
+            nakui_core::event_log::LogEntry::Morphism { seq, morphism, ops, .. } =>
+                println!("  #{:02} morph  {} ({} ops)", seq, morphism, ops.len()),
+        }
+    }
+
+    section("== replay verification (state) ==");
+    let replayed = replay(&log).expect("replay");
+    if store == replayed {
+        println!("  ok: replayed store byte-equal to live store");
+    } else {
+        println!("  MISMATCH");
+    }
+
+    section("== determinism verification (ops) ==");
+    match verify_log(&log, &exec) {
+        Ok(()) => println!(
+            "  ok: every logged morphism reproduced its ops on re-execution"
+        ),
+        Err(e) => println!("  nondeterminism detected: {}", e),
+    }
+
+    let _ = std::fs::remove_file(&log_path);
+}
+
+fn run_and_report(
+    exec: &Executor,
+    store: &mut MemoryStore,
+    log: &mut EventLog,
+    morphism: &str,
+    inputs: &[(&str, Uuid)],
+    params: serde_json::Value,
+) {
+    match execute_and_log(exec, store, log, morphism, inputs, params) {
+        Ok(ops) => println!("  ok ({} ops, logged at #{})", ops.len(), log.next_seq() - 1),
+        Err(ExecuteError::PreLog(e)) => println!("  rejected: {}", e),
+        Err(ExecuteError::LogAppend(e)) => println!("  LOG APPEND FAILED: {}", e),
+        Err(ExecuteError::PostLogStore(e)) => println!(
+            "  POST-LOG STORE FAILED (log canonical, store stale): {}", e
+        ),
+    }
+}
+
+fn print_stock(store: &MemoryStore, label: &str, id: Uuid) {
+    let v = store.load("Stock", id).expect("stock exists");
+    let cantidad = v.get("cantidad").and_then(|v| v.as_i64()).unwrap_or(0);
+    let sku = v.get("sku_id").and_then(|v| v.as_str()).unwrap_or("?");
+    println!("  {} cantidad={} sku={}", label, cantidad, sku);
+}
+
+fn print_caja(store: &MemoryStore, label: &str, id: Uuid) {
+    let v = store.load("Caja", id).expect("caja exists");
+    let saldo = v.get("saldo").and_then(|v| v.as_i64()).unwrap_or(0);
+    let cur = v.get("currency").and_then(|v| v.as_str()).unwrap_or("?");
+    println!("  {} saldo={} {} (en centavos)", label, saldo, cur);
+}
+
+fn section(title: &str) {
+    println!("\n{}", title);
+}
diff --git a/crates/modules/nakui/core/src/delta.rs b/crates/modules/nakui/core/src/delta.rs
new file mode 100644
index 0000000..35f3faf
--- /dev/null
+++ b/crates/modules/nakui/core/src/delta.rs
@@ -0,0 +1,72 @@
+use serde::{Deserialize, Serialize};
+use serde_json::Value;
+use uuid::Uuid;
+
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct FieldPath {
+    pub entity: String,
+    pub id: Uuid,
+    pub field: String,
+}
+
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+#[serde(tag = "op", rename_all = "snake_case")]
+pub enum FieldOp {
+    Set {
+        path: FieldPath,
+        value: Value,
+    },
+    Create {
+        entity: String,
+        id: Uuid,
+        data: Value,
+    },
+    Delete {
+        entity: String,
+        id: Uuid,
+    },
+}
+
+impl FieldOp {
+    /// Token a manifest's `writes` list matches against.
+    /// "Caja.saldo" for field updates, "Movimiento" for whole-record ops.
+    pub fn capability_token(&self) -> String {
+        match self {
+            FieldOp::Set { path, .. } => format!("{}.{}", path.entity, path.field),
+            FieldOp::Create { entity, .. } => entity.clone(),
+            FieldOp::Delete { entity, .. } => entity.clone(),
+        }
+    }
+}
+
+/// Apply only the ops that target `(entity, id)` to `state` and return the
+/// new value. Returns `None` if a Delete op removes the target — callers
+/// should skip post-checks against a deleted entity rather than running
+/// them against the stale prior state.
+pub fn simulate_on(state: &Value, entity: &str, id: Uuid, ops: &[FieldOp]) -> Option<Value> {
+    let mut s: Option<Value> = Some(state.clone());
+    for op in ops {
+        match op {
+            FieldOp::Set { path, value } if path.entity == entity && path.id == id => {
+                if let Some(Value::Object(map)) = s.as_mut() {
+                    map.insert(path.field.clone(), value.clone());
+                }
+            }
+            FieldOp::Create {
+                entity: e,
+                id: i,
+                data,
+            } if e == entity && *i == id => {
+                s = Some(data.clone());
+            }
+            FieldOp::Delete {
+                entity: e,
+                id: i,
+            } if e == entity && *i == id => {
+                s = None;
+            }
+            _ => {}
+        }
+    }
+    s
+}
diff --git a/crates/modules/nakui/core/src/drift.rs b/crates/modules/nakui/core/src/drift.rs
new file mode 100644
index 0000000..884ec6f
--- /dev/null
+++ b/crates/modules/nakui/core/src/drift.rs
@@ -0,0 +1,496 @@
+//! Drift detection: compare two snapshots of store state and surface
+//! the records that differ.
+//!
+//! "Drift" here means the live store has departed from what the log can
+//! reproduce. The `Store::hash_state` contract makes the binary check
+//! cheap (32 bytes); when those disagree, `compare_states` walks both
+//! enumerations and produces a diff list the operator can act on.
+//!
+//! No IO in this module. The wire bits (asking a `nakui run` server for
+//! its hash and records) live in the CLI; this is the pure comparison
+//! used by both the CLI and any future automated drift-watcher.
+
+use serde::Serialize;
+use serde_json::Value;
+use std::collections::HashMap;
+use std::io::{BufRead, BufReader, Write};
+use std::os::unix::net::UnixStream;
+use std::path::Path;
+use thiserror::Error;
+use uuid::Uuid;
+
+use crate::event_log::{EventLog, replay};
+use crate::store::Store;
+
+/// A single record-level difference between two snapshots. Variants are
+/// labeled from the perspective of the operator running the check: the
+/// "log" side is the canonical state (what the log replays to), the
+/// "server" side is the live state being audited.
+#[derive(Debug, Clone, PartialEq, Serialize)]
+#[serde(tag = "kind", rename_all = "snake_case")]
+pub enum DriftDiff {
+    /// Server has a record the log doesn't know about. Phantom data —
+    /// either an out-of-band write, or a successful op that never
+    /// reached the WAL (which would itself be a kernel bug).
+    OnlyOnServer {
+        entity: String,
+        id: Uuid,
+        value: Value,
+    },
+    /// Log expects a record the server lost. Either the server's apply
+    /// rolled back without a reconcile, or someone deleted a record
+    /// out-of-band.
+    OnlyInLog {
+        entity: String,
+        id: Uuid,
+        value: Value,
+    },
+    /// Same (entity, id) on both sides but the values differ — the most
+    /// dangerous case, because it means a logged event was overwritten
+    /// or a field was tampered with.
+    Tampered {
+        entity: String,
+        id: Uuid,
+        log_value: Value,
+        server_value: Value,
+    },
+}
+
+#[derive(Debug, Clone, Serialize)]
+pub struct DriftReport {
+    pub log_hash: [u8; 32],
+    pub server_hash: [u8; 32],
+    pub log_records: usize,
+    pub server_records: usize,
+    /// Empty iff the two snapshots are byte-identical. Sorted by
+    /// (entity, id_bytes) so two runs against the same drift produce
+    /// the same report.
+    pub diffs: Vec<DriftDiff>,
+}
+
+impl DriftReport {
+    pub fn in_sync(&self) -> bool {
+        self.log_hash == self.server_hash && self.diffs.is_empty()
+    }
+}
+
+/// Pure comparison: take two canonical-order enumerations (as returned
+/// by `Store::iter`) plus their hashes, and return the diff list.
+///
+/// Inputs need not be pre-sorted — we re-key by (entity, id) and walk
+/// the union — but if the iterators were produced via `Store::iter`,
+/// they're already in canonical order and the report's `diffs` will be
+/// emitted in that same order.
+pub fn compare_states(
+    log_records: Vec<(String, Uuid, Value)>,
+    log_hash: [u8; 32],
+    server_records: Vec<(String, Uuid, Value)>,
+    server_hash: [u8; 32],
+) -> DriftReport {
+    let log_count = log_records.len();
+    let server_count = server_records.len();
+
+    let mut log_map: HashMap<(String, Uuid), Value> = log_records
+        .into_iter()
+        .map(|(e, id, v)| ((e, id), v))
+        .collect();
+    let server_map: HashMap<(String, Uuid), Value> = server_records
+        .into_iter()
+        .map(|(e, id, v)| ((e, id), v))
+        .collect();
+
+    let mut diffs: Vec<DriftDiff> = Vec::new();
+    for ((entity, id), server_value) in &server_map {
+        match log_map.remove(&(entity.clone(), *id)) {
+            None => diffs.push(DriftDiff::OnlyOnServer {
+                entity: entity.clone(),
+                id: *id,
+                value: server_value.clone(),
+            }),
+            Some(log_value) => {
+                if log_value != *server_value {
+                    diffs.push(DriftDiff::Tampered {
+                        entity: entity.clone(),
+                        id: *id,
+                        log_value,
+                        server_value: server_value.clone(),
+                    });
+                }
+            }
+        }
+    }
+    // Whatever is left in log_map is missing on the server.
+    for ((entity, id), value) in log_map {
+        diffs.push(DriftDiff::OnlyInLog { entity, id, value });
+    }
+
+    // Canonical sort: (entity, id_bytes), then by variant kind so
+    // diff ordering is fully deterministic even when the same key
+    // appears (which it can't here, but defensively).
+    diffs.sort_by(|a, b| {
+        let (ea, ia) = key(a);
+        let (eb, ib) = key(b);
+        ea.cmp(eb)
+            .then_with(|| ia.as_bytes().cmp(ib.as_bytes()))
+            .then_with(|| variant_order(a).cmp(&variant_order(b)))
+    });
+
+    DriftReport {
+        log_hash,
+        server_hash,
+        log_records: log_count,
+        server_records: server_count,
+        diffs,
+    }
+}
+
+fn key(d: &DriftDiff) -> (&str, &Uuid) {
+    match d {
+        DriftDiff::OnlyOnServer { entity, id, .. }
+        | DriftDiff::OnlyInLog { entity, id, .. }
+        | DriftDiff::Tampered { entity, id, .. } => (entity.as_str(), id),
+    }
+}
+
+fn variant_order(d: &DriftDiff) -> u8 {
+    match d {
+        DriftDiff::OnlyInLog { .. } => 0,
+        DriftDiff::Tampered { .. } => 1,
+        DriftDiff::OnlyOnServer { .. } => 2,
+    }
+}
+
+#[derive(Debug, Error)]
+pub enum DriftError {
+    #[error("open log: {0}")]
+    Log(#[from] crate::event_log::LogError),
+    #[error("replay log: {0}")]
+    Replay(#[from] crate::event_log::ReplayError),
+    #[error("store: {0}")]
+    Store(#[from] crate::store::StoreError),
+    #[error("connect to server socket: {0}")]
+    Connect(#[source] std::io::Error),
+    #[error("server io: {0}")]
+    Io(#[from] std::io::Error),
+    #[error("server response not json: {0}")]
+    Parse(#[from] serde_json::Error),
+    #[error("server returned error for `{op}`: {msg}")]
+    Server { op: String, msg: String },
+    #[error("server response missing field `{field}` for op `{op}`")]
+    MissingField { op: String, field: String },
+    #[error("server hash `{0}` is not 32 hex bytes")]
+    BadHash(String),
+}
+
+/// Audit a live `nakui run` server against the canonical state derived
+/// from a log file.
+///
+/// Cheap path: ask the server for `hash_state`, replay the log locally,
+/// hash that. If the hashes match, we return immediately with an empty
+/// diff list — no large `dump_records` round-trip.
+///
+/// Expensive path: hashes differ. Pull the full record dump from the
+/// server, run `compare_states`, return the structured report.
+pub fn check_against_socket(
+    log_path: &Path,
+    socket_path: &Path,
+) -> Result<DriftReport, DriftError> {
+    // Local: replay log → MemoryStore, snapshot.
+    let log = EventLog::open(log_path)?;
+    let local_store = replay(&log)?;
+    let local_records: Vec<(String, Uuid, Value)> = local_store.iter()?.collect();
+    let local_hash = local_store.hash_state()?;
+
+    // Wire: open the connection once and reuse it for both requests.
+    let stream = UnixStream::connect(socket_path).map_err(DriftError::Connect)?;
+    let mut conn = SocketClient::new(stream)?;
+
+    // Cheap path.
+    let hash_resp = conn.exchange(serde_json::json!({"op": "hash_state"}))?;
+    require_ok(&hash_resp, "hash_state")?;
+    let server_hash = parse_hash(&hash_resp, "hash_state")?;
+    let server_count = hash_resp
+        .get("records")
+        .and_then(Value::as_u64)
+        .ok_or_else(|| DriftError::MissingField {
+            op: "hash_state".into(),
+            field: "records".into(),
+        })? as usize;
+
+    if server_hash == local_hash {
+        return Ok(DriftReport {
+            log_hash: local_hash,
+            server_hash,
+            log_records: local_records.len(),
+            server_records: server_count,
+            diffs: Vec::new(),
+        });
+    }
+
+    // Expensive path: pull the full server snapshot.
+    let dump_resp = conn.exchange(serde_json::json!({"op": "dump_records"}))?;
+    require_ok(&dump_resp, "dump_records")?;
+    let server_records = parse_records(&dump_resp)?;
+
+    Ok(compare_states(
+        local_records,
+        local_hash,
+        server_records,
+        server_hash,
+    ))
+}
+
+struct SocketClient {
+    writer: UnixStream,
+    reader: BufReader<UnixStream>,
+}
+
+impl SocketClient {
+    fn new(stream: UnixStream) -> Result<Self, DriftError> {
+        let reader_stream = stream.try_clone()?;
+        Ok(Self {
+            writer: stream,
+            reader: BufReader::new(reader_stream),
+        })
+    }
+
+    fn exchange(&mut self, req: Value) -> Result<Value, DriftError> {
+        let mut bytes = serde_json::to_vec(&req).expect("request serializes");
+        bytes.push(b'\n');
+        self.writer.write_all(&bytes)?;
+        let mut line = String::new();
+        let n = self.reader.read_line(&mut line)?;
+        if n == 0 {
+            return Err(DriftError::Io(std::io::Error::new(
+                std::io::ErrorKind::UnexpectedEof,
+                "server closed connection without responding",
+            )));
+        }
+        Ok(serde_json::from_str(line.trim())?)
+    }
+}
+
+fn require_ok(resp: &Value, op: &str) -> Result<(), DriftError> {
+    if resp.get("ok").and_then(Value::as_bool) == Some(true) {
+        Ok(())
+    } else {
+        Err(DriftError::Server {
+            op: op.into(),
+            msg: resp
+                .get("error")
+                .and_then(Value::as_str)
+                .unwrap_or("(no error message)")
+                .to_string(),
+        })
+    }
+}
+
+fn parse_hash(resp: &Value, op: &str) -> Result<[u8; 32], DriftError> {
+    let s = resp
+        .get("hash")
+        .and_then(Value::as_str)
+        .ok_or_else(|| DriftError::MissingField {
+            op: op.into(),
+            field: "hash".into(),
+        })?;
+    if s.len() != 64 {
+        return Err(DriftError::BadHash(s.into()));
+    }
+    let mut out = [0u8; 32];
+    for (i, byte) in out.iter_mut().enumerate() {
+        let hi = hex_nibble(s.as_bytes()[i * 2]).ok_or_else(|| DriftError::BadHash(s.into()))?;
+        let lo =
+            hex_nibble(s.as_bytes()[i * 2 + 1]).ok_or_else(|| DriftError::BadHash(s.into()))?;
+        *byte = (hi << 4) | lo;
+    }
+    Ok(out)
+}
+
+fn hex_nibble(c: u8) -> Option<u8> {
+    match c {
+        b'0'..=b'9' => Some(c - b'0'),
+        b'a'..=b'f' => Some(c - b'a' + 10),
+        b'A'..=b'F' => Some(c - b'A' + 10),
+        _ => None,
+    }
+}
+
+fn parse_records(resp: &Value) -> Result<Vec<(String, Uuid, Value)>, DriftError> {
+    let arr = resp
+        .get("records")
+        .and_then(Value::as_array)
+        .ok_or_else(|| DriftError::MissingField {
+            op: "dump_records".into(),
+            field: "records".into(),
+        })?;
+    let mut out: Vec<(String, Uuid, Value)> = Vec::with_capacity(arr.len());
+    for item in arr {
+        let entity = item
+            .get("entity")
+            .and_then(Value::as_str)
+            .ok_or_else(|| DriftError::MissingField {
+                op: "dump_records".into(),
+                field: "records[].entity".into(),
+            })?
+            .to_string();
+        let id_str = item
+            .get("id")
+            .and_then(Value::as_str)
+            .ok_or_else(|| DriftError::MissingField {
+                op: "dump_records".into(),
+                field: "records[].id".into(),
+            })?;
+        let id = Uuid::parse_str(id_str).map_err(|_| DriftError::MissingField {
+            op: "dump_records".into(),
+            field: format!("records[].id (not uuid: {})", id_str),
+        })?;
+        let value = item
+            .get("value")
+            .cloned()
+            .ok_or_else(|| DriftError::MissingField {
+                op: "dump_records".into(),
+                field: "records[].value".into(),
+            })?;
+        out.push((entity, id, value));
+    }
+    Ok(out)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use serde_json::json;
+
+    fn h(byte: u8) -> [u8; 32] {
+        [byte; 32]
+    }
+
+    #[test]
+    fn empty_inputs_yield_no_diffs() {
+        let report = compare_states(Vec::new(), h(0), Vec::new(), h(0));
+        assert!(report.in_sync());
+        assert!(report.diffs.is_empty());
+    }
+
+    #[test]
+    fn equal_records_yield_no_diffs_even_if_hashes_were_lied_to() {
+        // The function compares records, not hashes — hash equality is
+        // the operator's fast-path, but the report's truth is the diffs.
+        let a = Uuid::new_v4();
+        let log = vec![(
+            "Caja".to_string(),
+            a,
+            json!({"saldo": 100}),
+        )];
+        let server = vec![(
+            "Caja".to_string(),
+            a,
+            json!({"saldo": 100}),
+        )];
+        let report = compare_states(log, h(1), server, h(2));
+        assert!(report.diffs.is_empty(), "records equal → no diffs");
+    }
+
+    #[test]
+    fn detects_only_on_server() {
+        let a = Uuid::new_v4();
+        let b = Uuid::new_v4();
+        let log = vec![(
+            "Caja".to_string(),
+            a,
+            json!({"saldo": 100}),
+        )];
+        let server = vec![
+            ("Caja".to_string(), a, json!({"saldo": 100})),
+            ("Caja".to_string(), b, json!({"saldo": 999})),
+        ];
+        let report = compare_states(log, h(0), server, h(1));
+        assert_eq!(report.diffs.len(), 1);
+        match &report.diffs[0] {
+            DriftDiff::OnlyOnServer { entity, id, .. } => {
+                assert_eq!(entity, "Caja");
+                assert_eq!(*id, b);
+            }
+            other => panic!("expected OnlyOnServer, got {:?}", other),
+        }
+    }
+
+    #[test]
+    fn detects_only_in_log() {
+        let a = Uuid::new_v4();
+        let log = vec![("Caja".to_string(), a, json!({"saldo": 100}))];
+        let server = vec![];
+        let report = compare_states(log, h(0), server, h(1));
+        assert_eq!(report.diffs.len(), 1);
+        match &report.diffs[0] {
+            DriftDiff::OnlyInLog { id, .. } => assert_eq!(*id, a),
+            other => panic!("expected OnlyInLog, got {:?}", other),
+        }
+    }
+
+    #[test]
+    fn detects_tampered() {
+        let a = Uuid::new_v4();
+        let log = vec![("Caja".to_string(), a, json!({"saldo": 100}))];
+        let server = vec![("Caja".to_string(), a, json!({"saldo": 999}))];
+        let report = compare_states(log, h(0), server, h(1));
+        assert_eq!(report.diffs.len(), 1);
+        match &report.diffs[0] {
+            DriftDiff::Tampered {
+                id,
+                log_value,
+                server_value,
+                ..
+            } => {
+                assert_eq!(*id, a);
+                assert_eq!(log_value["saldo"], json!(100));
+                assert_eq!(server_value["saldo"], json!(999));
+            }
+            other => panic!("expected Tampered, got {:?}", other),
+        }
+    }
+
+    #[test]
+    fn diffs_emerge_in_canonical_order() {
+        // Two entities, mixed drift kinds. Result must be sorted by
+        // (entity, id_bytes) so two runs produce the same report.
+        let id_caja = Uuid::nil(); // sorts first byte-wise
+        let id_mov = Uuid::from_u128(u128::MAX);
+
+        let log = vec![
+            ("Movimiento".to_string(), id_mov, json!({"x": 1})),
+        ];
+        let server = vec![
+            ("Caja".to_string(), id_caja, json!({"saldo": 0})),
+        ];
+        let report = compare_states(log, h(0), server, h(1));
+        assert_eq!(report.diffs.len(), 2);
+        // Caja sorts before Movimiento.
+        match (&report.diffs[0], &report.diffs[1]) {
+            (DriftDiff::OnlyOnServer { entity: e1, .. }, DriftDiff::OnlyInLog { entity: e2, .. }) => {
+                assert_eq!(e1, "Caja");
+                assert_eq!(e2, "Movimiento");
+            }
+            other => panic!("unexpected order: {:?}", other),
+        }
+    }
+
+    #[test]
+    fn in_sync_requires_both_hashes_and_no_diffs() {
+        // Defensive: if hashes match but somehow diffs is non-empty
+        // (caller mismatch), in_sync says no.
+        let report = DriftReport {
+            log_hash: h(0),
+            server_hash: h(0),
+            log_records: 1,
+            server_records: 1,
+            diffs: vec![DriftDiff::Tampered {
+                entity: "x".into(),
+                id: Uuid::nil(),
+                log_value: json!(1),
+                server_value: json!(2),
+            }],
+        };
+        assert!(!report.in_sync());
+    }
+}
diff --git a/crates/modules/nakui/core/src/event_log.rs b/crates/modules/nakui/core/src/event_log.rs
new file mode 100644
index 0000000..1a3d2f5
--- /dev/null
+++ b/crates/modules/nakui/core/src/event_log.rs
@@ -0,0 +1,687 @@
+//! Append-only event log for deterministic replay.
+//!
+//! Two entry kinds:
+//!   - `Seed`: an externally-provided initial record (the system boundary).
+//!   - `Morphism`: a successful kernel-validated morphism call, with the
+//!     produced ops attached.
+//!
+//! `replay()` reconstructs a store by reading the log and applying ops
+//! directly — fast, no script execution. `verify_log()` re-runs every
+//! morphism through the kernel and asserts the recomputed ops match the
+//! logged ones, which is the operational definition of determinism.
+//!
+//! Failures are never logged: a rejected morphism produces no event.
+
+use serde::{Deserialize, Serialize};
+use serde_json::Value;
+use std::collections::{BTreeMap, HashMap};
+use std::fs::OpenOptions;
+use std::io::{BufRead, BufReader, Write};
+use std::path::{Path, PathBuf};
+use thiserror::Error;
+use uuid::Uuid;
+
+use crate::delta::FieldOp;
+use crate::executor::{ExecError, Executor};
+use crate::store::{MemoryStore, Store, StoreError};
+
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+#[serde(tag = "kind", rename_all = "snake_case")]
+pub enum LogEntry {
+    Seed {
+        seq: u64,
+        entity: String,
+        id: Uuid,
+        data: Value,
+        /// Bundle hash (just the KCL schemas) at the moment this seed
+        /// was logged. `None` for pre-versioning entries — `verify_log`
+        /// skips the schema check on those. New writes always populate
+        /// it via `seed_and_log`.
+        #[serde(default, skip_serializing_if = "Option::is_none")]
+        schema_hash: Option<[u8; 32]>,
+    },
+    Morphism {
+        seq: u64,
+        morphism: String,
+        inputs: BTreeMap<String, Uuid>,
+        params: Value,
+        ops: Vec<FieldOp>,
+        /// Hash of (kcl bundle | manifest spec | rhai script bytes) at
+        /// the moment this event was logged. `None` for pre-versioning
+        /// entries — `verify_log` skips the schema check on those (they
+        /// predate the contract). New writes always populate it.
+        #[serde(default, skip_serializing_if = "Option::is_none")]
+        schema_hash: Option<[u8; 32]>,
+    },
+}
+
+impl LogEntry {
+    pub fn seq(&self) -> u64 {
+        match self {
+            LogEntry::Seed { seq, .. } => *seq,
+            LogEntry::Morphism { seq, .. } => *seq,
+        }
+    }
+}
+
+#[derive(Debug, Error)]
+pub enum LogError {
+    #[error("io: {0}")]
+    Io(#[from] std::io::Error),
+    #[error("parse at line {line}: {source}")]
+    Parse {
+        line: usize,
+        #[source]
+        source: serde_json::Error,
+    },
+    #[error("non-monotonic seq: got {got}, expected {expected}")]
+    NonMonotonic { got: u64, expected: u64 },
+}
+
+/// Errors from `execute_and_log`. The variants distinguish *when in the
+/// pipeline* the failure occurred — which determines whether the log was
+/// updated and whether the live store is still consistent.
+#[derive(Debug, Error)]
+pub enum ExecuteError {
+    /// Failure before the log was written. Store untouched, log untouched.
+    /// Safe to retry with the same inputs.
+    #[error("pre-log validation failed: {0}")]
+    PreLog(#[from] ExecError),
+
+    /// Log append failed (typically IO). Store untouched, log untouched.
+    /// Safe to retry once the log backend recovers.
+    #[error("log append failed: {0}")]
+    LogAppend(#[from] LogError),
+
+    /// Apply to the store failed AFTER the event was logged. The log is
+    /// canonical; the live store is now stale and should be rebuilt by
+    /// replaying the log. Retrying the same morphism is incorrect — the
+    /// event is already on disk.
+    #[error("store apply failed after log was committed (log is canonical, store stale): {0}")]
+    PostLogStore(crate::store::StoreError),
+}
+
+#[derive(Debug, Error)]
+pub enum ReplayError {
+    #[error("log: {0}")]
+    Log(#[from] LogError),
+    #[error("store: {0}")]
+    Store(#[from] StoreError),
+}
+
+/// A reconcile rebuilds a stale store from the log. Either the wipe step
+/// or the replay step can fail.
+#[derive(Debug, Error)]
+pub enum ReconcileError {
+    #[error("clearing store before replay failed: {0}")]
+    Clear(#[source] StoreError),
+    #[error("replay into cleared store failed: {0}")]
+    Replay(#[from] ReplayError),
+}
+
+/// Outcome of `execute_and_log_with_recovery`. PreLog/LogAppend mirror the
+/// pre-WAL-fence variants of `ExecuteError` — the store is untouched and
+/// the caller can retry. `Unrecoverable` means the WAL fence was crossed
+/// (event is canonical on disk) but reconcile *also* failed: the operator
+/// must intervene before any further writes.
+#[derive(Debug, Error)]
+pub enum RecoverableExecuteError {
+    #[error("pre-log validation failed: {0}")]
+    PreLog(#[from] ExecError),
+    #[error("log append failed: {0}")]
+    LogAppend(#[from] LogError),
+    #[error(
+        "store apply failed AND reconcile failed — log is canonical, store is in an unknown state. apply: {post_log}; reconcile: {reconcile}"
+    )]
+    Unrecoverable {
+        #[source]
+        post_log: StoreError,
+        reconcile: ReconcileError,
+    },
+}
+
+#[derive(Debug, Error)]
+pub enum VerifyError {
+    #[error("log: {0}")]
+    Log(#[from] LogError),
+    #[error("morphism replay failed at seq {seq}: {source}")]
+    Exec {
+        seq: u64,
+        #[source]
+        source: ExecError,
+    },
+    #[error(
+        "non-determinism at seq {seq} morphism `{morphism}`: recomputed ops differ from logged ops"
+    )]
+    OpsMismatch {
+        seq: u64,
+        morphism: String,
+        expected: Vec<FieldOp>,
+        actual: Vec<FieldOp>,
+    },
+    /// The morphism was logged under a different schema/script bundle
+    /// than the one currently loaded. Re-executing it would (likely)
+    /// produce different ops, but the more specific signal is "the
+    /// rules changed since this was logged" — actionable: migrate the
+    /// log, or pin the executor to a compatible version.
+    #[error(
+        "schema mismatch at seq {seq} morphism `{morphism}`: logged schema_hash differs from current executor"
+    )]
+    SchemaMismatch {
+        seq: u64,
+        morphism: String,
+        logged: [u8; 32],
+        current: [u8; 32],
+    },
+    /// A `Seed` entry was logged under a different KCL bundle than the
+    /// one currently loaded. The seed's data may no longer fit the
+    /// entity definition. Coarser than `SchemaMismatch` (any change
+    /// to any schema file flips it, even one that doesn't affect the
+    /// seeded entity) but the operator still wants to know.
+    #[error(
+        "seed schema mismatch at seq {seq} entity `{entity}` id {id}: logged bundle hash differs from current executor"
+    )]
+    SeedSchemaMismatch {
+        seq: u64,
+        entity: String,
+        id: Uuid,
+        logged: [u8; 32],
+        current: [u8; 32],
+    },
+}
+
+pub struct EventLog {
+    path: PathBuf,
+    next_seq: u64,
+}
+
+impl EventLog {
+    /// Open or create a log at `path`. Reads existing entries to compute
+    /// `next_seq` and validate monotonicity. The first entry can start at
+    /// any seq (compacted logs are rooted at seq > 0); subsequent entries
+    /// must be strictly contiguous.
+    pub fn open(path: impl Into<PathBuf>) -> Result<Self, LogError> {
+        let path = path.into();
+        let mut next_seq: u64 = 0;
+        if path.exists() {
+            let entries = read_entries(&path)?;
+            let mut iter = entries.iter();
+            if let Some(first) = iter.next() {
+                next_seq = first.seq() + 1;
+                for e in iter {
+                    if e.seq() != next_seq {
+                        return Err(LogError::NonMonotonic {
+                            got: e.seq(),
+                            expected: next_seq,
+                        });
+                    }
+                    next_seq = e.seq() + 1;
+                }
+            }
+        }
+        Ok(Self { path, next_seq })
+    }
+
+    pub fn next_seq(&self) -> u64 {
+        self.next_seq
+    }
+
+    pub fn path(&self) -> &Path {
+        &self.path
+    }
+
+    /// Append an entry. Calls `sync_all()` so the entry is durable on disk
+    /// before returning Ok — this is the WAL fence: by the time the caller
+    /// proceeds to mutate the store, the event is recoverable from a power
+    /// loss.
+    pub fn append(&mut self, entry: LogEntry) -> Result<(), LogError> {
+        if entry.seq() != self.next_seq {
+            return Err(LogError::NonMonotonic {
+                got: entry.seq(),
+                expected: self.next_seq,
+            });
+        }
+        let mut f = OpenOptions::new()
+            .create(true)
+            .append(true)
+            .open(&self.path)?;
+        let s = serde_json::to_string(&entry).expect("LogEntry serializes");
+        f.write_all(s.as_bytes())?;
+        f.write_all(b"\n")?;
+        f.sync_all()?;
+        self.next_seq += 1;
+        Ok(())
+    }
+
+    pub fn entries(&self) -> Result<Vec<LogEntry>, LogError> {
+        if !self.path.exists() {
+            return Ok(Vec::new());
+        }
+        read_entries(&self.path)
+    }
+
+    /// Truncate the log to drop entries with `seq <= through_seq`.
+    /// IRREVERSIBLE: caller must verify a Snapshot covering `through_seq`
+    /// exists on durable storage before calling this — once the entries
+    /// are gone, replay can only start from the snapshot.
+    ///
+    /// Atomic at the filesystem level: writes survivors to a sibling
+    /// tempfile then renames over the original.
+    pub fn compact_through(&mut self, through_seq: u64) -> Result<(), LogError> {
+        let survivors: Vec<LogEntry> = self
+            .entries()?
+            .into_iter()
+            .filter(|e| e.seq() > through_seq)
+            .collect();
+
+        let tmp = self.path.with_extension("compacting");
+        {
+            let mut f = std::fs::File::create(&tmp)?;
+            for e in &survivors {
+                let s = serde_json::to_string(e).expect("LogEntry serializes");
+                f.write_all(s.as_bytes())?;
+                f.write_all(b"\n")?;
+            }
+            f.sync_all()?;
+        }
+        std::fs::rename(&tmp, &self.path)?;
+        sync_parent_dir(&self.path)?;
+        Ok(())
+    }
+}
+
+/// Open and fsync the parent directory of `target`. After an atomic
+/// rename, the directory entry change isn't durable until the directory
+/// itself is fsynced — without this, a kernel/power crash between the
+/// rename and the next disk flush could leave the directory in a state
+/// where the rename never happened (depending on filesystem journal
+/// mode). With it, the rename survives.
+///
+/// Best-effort on platforms where opening a directory for sync isn't
+/// permitted: the syscalls are POSIX-portable across Linux, macOS, and
+/// the BSDs (the OSes Nakui targets), so this generally succeeds. A
+/// failure here is propagated as an IO error so the caller can choose
+/// to surface it; we prefer "loud" over "silent" for durability code.
+fn sync_parent_dir(target: &Path) -> std::io::Result<()> {
+    let parent = target.parent().unwrap_or_else(|| Path::new("."));
+    let dir = std::fs::File::open(parent)?;
+    dir.sync_all()
+}
+
+/// A snapshot of a `Store`'s state at a particular log seq. Lets us short-
+/// circuit replay: load the snapshot, then apply only the events with
+/// `seq > snapshot.seq`. MemoryStore-specific for V1 — backends that
+/// already persist (SurrealStore + RocksDB) don't need this layer.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Snapshot {
+    /// The last log seq this snapshot subsumes. `replay` resumes at seq+1.
+    pub seq: u64,
+    /// Full state at that seq, in MemoryStore's native shape.
+    pub records: HashMap<String, HashMap<Uuid, Value>>,
+    /// Module schema hash at capture time. `Some` for snapshots taken
+    /// via `capture(_, _, executor)`; `None` for those taken via the
+    /// hash-unaware `from_memory_store`. Loaders use this to refuse a
+    /// snapshot produced under a different bundle.
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub schema_hash: Option<[u8; 32]>,
+}
+
+#[derive(Debug, Error)]
+pub enum SnapshotMismatchError {
+    #[error(
+        "snapshot schema_hash differs from current executor; refusing to load (snapshot was taken under a different module bundle)"
+    )]
+    SchemaMismatch {
+        snapshot: [u8; 32],
+        current: [u8; 32],
+    },
+}
+
+impl Snapshot {
+    /// Capture the in-memory store's current state without binding to a
+    /// schema bundle. Test fixtures and ad-hoc tooling call this; the
+    /// production path uses `capture` so the snapshot can be validated
+    /// against the executor on load.
+    pub fn from_memory_store(store: &MemoryStore, seq: u64) -> Self {
+        Self {
+            seq,
+            records: store.records().clone(),
+            schema_hash: None,
+        }
+    }
+
+    /// Production capture: stamp the snapshot with the executor's
+    /// `module_schema_hash` so future loads can refuse a mismatch.
+    pub fn capture(store: &MemoryStore, seq: u64, executor: &Executor) -> Self {
+        Self {
+            seq,
+            records: store.records().clone(),
+            schema_hash: Some(executor.module_schema_hash()),
+        }
+    }
+
+    /// Verify the snapshot was produced under a bundle compatible with
+    /// `executor`. Snapshots without a hash (legacy / `from_memory_store`)
+    /// pass — the operator opted out of this check at capture time.
+    pub fn ensure_compatible_with(
+        &self,
+        executor: &Executor,
+    ) -> Result<(), SnapshotMismatchError> {
+        let Some(snap_hash) = self.schema_hash else {
+            return Ok(());
+        };
+        let current = executor.module_schema_hash();
+        if snap_hash != current {
+            return Err(SnapshotMismatchError::SchemaMismatch {
+                snapshot: snap_hash,
+                current,
+            });
+        }
+        Ok(())
+    }
+
+    /// Atomically write the snapshot to `path`. Writes the bytes to a
+    /// sibling tempfile (`<path>.writing`), fsyncs, renames over the
+    /// target, then fsyncs the parent directory so the rename survives
+    /// a crash. A crash mid-write leaves either the previous snapshot
+    /// at `path` (rename never happened) or the new one (rename
+    /// completed and was durable) — never a truncated file. A stale
+    /// tempfile from a prior crash gets overwritten by `File::create`
+    /// on the next attempt, so writes are also self-healing.
+    pub fn write(&self, path: &Path) -> Result<(), LogError> {
+        let data = serde_json::to_vec_pretty(self).expect("snapshot serializes");
+        let tmp = path.with_extension("writing");
+        {
+            let mut f = std::fs::File::create(&tmp)?;
+            f.write_all(&data)?;
+            f.sync_all()?;
+        }
+        std::fs::rename(&tmp, path)?;
+        sync_parent_dir(path).map_err(LogError::Io)
+    }
+
+    pub fn load(path: &Path) -> Result<Option<Self>, LogError> {
+        if !path.exists() {
+            return Ok(None);
+        }
+        let text = std::fs::read_to_string(path).map_err(LogError::Io)?;
+        let snap: Snapshot = serde_json::from_str(&text).map_err(|e| LogError::Parse {
+            line: 0,
+            source: e,
+        })?;
+        Ok(Some(snap))
+    }
+}
+
+fn read_entries(path: &Path) -> Result<Vec<LogEntry>, LogError> {
+    let f = std::fs::File::open(path)?;
+    let r = BufReader::new(f);
+    let mut out = Vec::new();
+    for (i, line) in r.lines().enumerate() {
+        let line = line?;
+        if line.trim().is_empty() {
+            continue;
+        }
+        let entry: LogEntry = serde_json::from_str(&line).map_err(|e| LogError::Parse {
+            line: i + 1,
+            source: e,
+        })?;
+        out.push(entry);
+    }
+    Ok(out)
+}
+
+/// Seed an entity into the store and persist the event.
+///
+/// WAL order: append to log *first*, then mutate the store. If the log
+/// append fails, the store is untouched and the caller can safely retry.
+/// `Store::seed` is infallible by trait contract — once the log entry is
+/// durable the store update is guaranteed to land for in-memory backends.
+/// For backends with fallible writes (network/disk), failures surface as
+/// a panic during `seed()`; callers that need a fallible seed path should
+/// wrap their own retry/reconcile loop.
+pub fn seed_and_log<S: Store>(
+    executor: &Executor,
+    store: &mut S,
+    log: &mut EventLog,
+    entity: &str,
+    id: Uuid,
+    data: Value,
+) -> Result<(), LogError> {
+    let seq = log.next_seq();
+    log.append(LogEntry::Seed {
+        seq,
+        entity: entity.to_string(),
+        id,
+        data: data.clone(),
+        schema_hash: Some(executor.schema_bundle_hash),
+    })?;
+    store.seed(entity, id, data);
+    // Best-effort: a failure here means next startup does an extra full
+    // replay, never a correctness issue.
+    let _ = store.set_last_applied_seq(seq);
+    Ok(())
+}
+
+/// Run a morphism and persist the event in WAL order:
+///   1. compute() — pure, no mutation; full kernel validation incl. dry-run.
+///   2. log.append() — event hits disk *before* the store changes.
+///   3. store.apply() — materialize the change. By WAL semantics the log
+///      is now the source of truth: if (3) fails, the stale store can be
+///      rebuilt by replaying the log.
+///
+/// The error variants tell the caller exactly which stage failed so they
+/// know whether to retry, recover, or rebuild.
+pub fn execute_and_log<S: Store>(
+    executor: &Executor,
+    store: &mut S,
+    log: &mut EventLog,
+    morphism: &str,
+    inputs: &[(&str, Uuid)],
+    params: Value,
+) -> Result<Vec<FieldOp>, ExecuteError> {
+    let ops = executor.compute(store, morphism, inputs, params.clone())?;
+    let seq = log.next_seq();
+    let entry = LogEntry::Morphism {
+        seq,
+        morphism: morphism.to_string(),
+        inputs: inputs
+            .iter()
+            .map(|(r, id)| (r.to_string(), *id))
+            .collect(),
+        params,
+        ops: ops.clone(),
+        schema_hash: executor.schema_hash(morphism),
+    };
+    log.append(entry)?;
+    store.apply(&ops).map_err(ExecuteError::PostLogStore)?;
+    let _ = store.set_last_applied_seq(seq);
+    Ok(ops)
+}
+
+/// Rebuild a (possibly stale) store from the log. Wipes the store, then
+/// replays every event. Use this after a `PostLogStore` failure: the WAL
+/// fence guarantees the log is the source of truth, so a clean replay
+/// brings the store back into agreement with it.
+///
+/// `execute_and_log_with_recovery` automates this for the common case;
+/// reach for `reconcile` directly when an operator/CLI is doing the
+/// recovery, or when a backend reports drift detected out-of-band.
+pub fn reconcile<S: Store>(store: &mut S, log: &EventLog) -> Result<(), ReconcileError> {
+    store.clear().map_err(ReconcileError::Clear)?;
+    replay_into(log, store)?;
+    Ok(())
+}
+
+/// Like `execute_and_log`, but on `PostLogStore` automatically rebuilds
+/// the store from the log and returns the ops as if the apply had
+/// succeeded. The caller sees a consistent post-state — either the event
+/// landed cleanly, or it landed via reconcile, or `Unrecoverable` (which
+/// means even the rebuild failed and the store must not be trusted).
+///
+/// PreLog and LogAppend are forwarded verbatim: the WAL fence wasn't
+/// crossed, so there's nothing to reconcile.
+pub fn execute_and_log_with_recovery<S: Store>(
+    executor: &Executor,
+    store: &mut S,
+    log: &mut EventLog,
+    morphism: &str,
+    inputs: &[(&str, Uuid)],
+    params: Value,
+) -> Result<Vec<FieldOp>, RecoverableExecuteError> {
+    let ops = executor.compute(store, morphism, inputs, params.clone())?;
+    let seq = log.next_seq();
+    let entry = LogEntry::Morphism {
+        seq,
+        morphism: morphism.to_string(),
+        inputs: inputs
+            .iter()
+            .map(|(r, id)| (r.to_string(), *id))
+            .collect(),
+        params,
+        ops: ops.clone(),
+        schema_hash: executor.schema_hash(morphism),
+    };
+    log.append(entry)?;
+    if let Err(post_log) = store.apply(&ops) {
+        if let Err(reconcile) = reconcile(store, log) {
+            return Err(RecoverableExecuteError::Unrecoverable {
+                post_log,
+                reconcile,
+            });
+        }
+        // After reconcile the store reflects log state up to log.next_seq()-1
+        // (which equals our seq). The reconcile path itself updated the
+        // marker; nothing more to do here.
+    } else {
+        let _ = store.set_last_applied_seq(seq);
+    }
+    Ok(ops)
+}
+
+/// Replay the log into a caller-provided `Store`. The store should be
+/// empty on entry; existing records are not erased. Use this with any
+/// `Store` impl (MemoryStore, SurrealStore, future backends).
+pub fn replay_into<S: Store>(log: &EventLog, store: &mut S) -> Result<(), ReplayError> {
+    replay_with_snapshot_into(log, None, store)
+}
+
+/// Replay starting from a snapshot. If `snapshot` is `Some`, every record
+/// in it is seeded into `store` first, then events with `seq > snapshot.seq`
+/// are applied. The point: replay cost shrinks from O(events) to
+/// O(events_after_snapshot), useful when the log grows large.
+pub fn replay_with_snapshot_into<S: Store>(
+    log: &EventLog,
+    snapshot: Option<&Snapshot>,
+    store: &mut S,
+) -> Result<(), ReplayError> {
+    let start_seq = if let Some(snap) = snapshot {
+        for (entity, recs) in &snap.records {
+            for (id, data) in recs {
+                store.seed(entity, *id, data.clone());
+            }
+        }
+        snap.seq + 1
+    } else {
+        0
+    };
+
+    let mut last_applied: Option<u64> = snapshot.map(|s| s.seq);
+    for entry in log.entries()? {
+        if entry.seq() < start_seq {
+            continue;
+        }
+        let seq = entry.seq();
+        match entry {
+            LogEntry::Seed {
+                entity, id, data, ..
+            } => store.seed(&entity, id, data),
+            LogEntry::Morphism { ops, .. } => store.apply(&ops)?,
+        }
+        last_applied = Some(seq);
+    }
+    if let Some(seq) = last_applied {
+        let _ = store.set_last_applied_seq(seq);
+    }
+    Ok(())
+}
+
+/// Convenience: replay into a fresh `MemoryStore`. The fast path: O(events)
+/// with no Rhai execution.
+pub fn replay(log: &EventLog) -> Result<MemoryStore, ReplayError> {
+    let mut store = MemoryStore::new();
+    replay_into(log, &mut store)?;
+    Ok(store)
+}
+
+/// Re-execute every logged morphism through the kernel and assert the
+/// recomputed ops match the logged ops byte-for-byte. This is the
+/// determinism contract: if it ever fails, a morphism became impure.
+pub fn verify_log(log: &EventLog, executor: &Executor) -> Result<(), VerifyError> {
+    let mut store = MemoryStore::new();
+    for entry in log.entries()? {
+        match entry {
+            LogEntry::Seed {
+                seq,
+                entity,
+                id,
+                data,
+                schema_hash,
+            } => {
+                if let Some(logged_hash) = schema_hash {
+                    let current_hash = executor.schema_bundle_hash;
+                    if logged_hash != current_hash {
+                        return Err(VerifyError::SeedSchemaMismatch {
+                            seq,
+                            entity,
+                            id,
+                            logged: logged_hash,
+                            current: current_hash,
+                        });
+                    }
+                }
+                store.seed(&entity, id, data);
+            }
+            LogEntry::Morphism {
+                seq,
+                morphism,
+                inputs,
+                params,
+                ops: logged,
+                schema_hash,
+            } => {
+                // Schema check first: if the rules changed, re-execution
+                // is meaningless — it'd just surface as OpsMismatch with
+                // a less actionable message. Legacy entries with no
+                // hash predate the contract; we let those through.
+                if let Some(logged_hash) = schema_hash {
+                    if let Some(current_hash) = executor.schema_hash(&morphism) {
+                        if logged_hash != current_hash {
+                            return Err(VerifyError::SchemaMismatch {
+                                seq,
+                                morphism,
+                                logged: logged_hash,
+                                current: current_hash,
+                            });
+                        }
+                    }
+                }
+                let owned: Vec<(String, Uuid)> = inputs.into_iter().collect();
+                let refs: Vec<(&str, Uuid)> =
+                    owned.iter().map(|(r, id)| (r.as_str(), *id)).collect();
+                let recomputed = executor
+                    .run(&mut store, &morphism, &refs, params)
+                    .map_err(|e| VerifyError::Exec { seq, source: e })?;
+                if recomputed != logged {
+                    return Err(VerifyError::OpsMismatch {
+                        seq,
+                        morphism,
+                        expected: logged,
+                        actual: recomputed,
+                    });
+                }
+            }
+        }
+    }
+    Ok(())
+}
diff --git a/crates/modules/nakui/core/src/executor.rs b/crates/modules/nakui/core/src/executor.rs
new file mode 100644
index 0000000..07627b7
--- /dev/null
+++ b/crates/modules/nakui/core/src/executor.rs
@@ -0,0 +1,667 @@
+use serde_json::{Value, json};
+use sha2::{Digest, Sha256};
+use std::collections::{BTreeMap, HashMap, HashSet};
+use std::path::{Path, PathBuf};
+use thiserror::Error;
+use uuid::Uuid;
+
+use crate::delta::{FieldOp, simulate_on};
+use crate::graph::{GraphError, ManifestGraph};
+use crate::kcl_wrapper::{self, KclError};
+use crate::manifest::{ConserveRule, Manifest, ManifestError, MorphismSpec, ValidationError};
+use crate::rhai_executor::{RhaiError, RhaiExecutor};
+use crate::store::{Store, StoreError};
+
+#[derive(Debug, Error)]
+pub enum ExecError {
+    #[error("morphism `{0}` not in manifest")]
+    UnknownMorphism(String),
+    #[error("missing input role `{role}` for morphism `{morphism}`")]
+    MissingInput { morphism: String, role: String },
+    #[error("duplicate input id {id} bound to roles `{role_a}` and `{role_b}`")]
+    DuplicateInputId {
+        id: Uuid,
+        role_a: String,
+        role_b: String,
+    },
+    #[error("entity `{0}` id `{1}` not found in store")]
+    EntityMissing(String, Uuid),
+    #[error(
+        "capability violation: morphism `{morphism}` produced op on `{token}` not in writes={declared:?}"
+    )]
+    CapabilityViolation {
+        morphism: String,
+        token: String,
+        declared: Vec<String>,
+    },
+    #[error(
+        "conservation violated: Σ Δ {entity}.{field} where {group_by} = {group:?} = {total} (expected 0)"
+    )]
+    ConservationViolation {
+        entity: String,
+        field: String,
+        group_by: String,
+        group: String,
+        total: i128,
+    },
+    #[error("conservation rule {entity}.{field}: {message}")]
+    ConservationMalformed {
+        entity: String,
+        field: String,
+        message: String,
+    },
+    #[error("kcl pre-check failed on `{role}` ({entity}): {source}")]
+    KclPre {
+        role: String,
+        entity: String,
+        #[source]
+        source: KclError,
+    },
+    #[error("kcl post-check failed on `{role}` ({entity}): {source}")]
+    KclPost {
+        role: String,
+        entity: String,
+        #[source]
+        source: KclError,
+    },
+    #[error("kcl post-check failed on created {entity} {id}: {source}")]
+    KclPostCreate {
+        entity: String,
+        id: Uuid,
+        #[source]
+        source: KclError,
+    },
+    #[error("rhai: {0}")]
+    Rhai(#[from] RhaiError),
+    #[error("store: {0}")]
+    Store(#[from] StoreError),
+    #[error("manifest: {0}")]
+    Manifest(#[from] ManifestError),
+    #[error("manifest validation: {0}")]
+    ManifestValidation(#[from] ValidationError),
+    #[error("manifest graph: {0}")]
+    Graph(#[from] GraphError),
+    #[error("io: {0}")]
+    Io(#[from] std::io::Error),
+}
+
+pub struct Executor {
+    pub manifest: Manifest,
+    pub graph: ManifestGraph,
+    pub module_dir: PathBuf,
+    pub schema_path: PathBuf,
+    pub rhai: RhaiExecutor,
+    /// `true` when `schema_path` is a tempfile bundle created by
+    /// `load_module`; Drop removes it. `false` for inline-built executors
+    /// that point at a real schema file owned by the caller (tests).
+    pub owned_bundle: bool,
+    /// Per-morphism `schema_hash`: SHA-256 of (kcl bundle + manifest spec
+    /// + rhai script bytes), computed once at load. The hash is the
+    /// determinism contract for KCL evolution — `verify_log` uses it to
+    /// reject logs whose entries were produced under different rules.
+    pub schema_hashes: HashMap<String, [u8; 32]>,
+    /// Module-wide bundle hash: SHA-256 of just the KCL bundle bytes.
+    /// Stamped onto every `LogEntry::Seed` via `seed_and_log` so
+    /// `verify_log` can flag seeds whose entity schemas have evolved
+    /// since they were logged. Coarser than `schema_hashes` (any
+    /// schema.k edit moves it, even one that doesn't affect the seeded
+    /// entity) but cheap and conservative — false positives over false
+    /// negatives, like the morphism hash.
+    pub schema_bundle_hash: [u8; 32],
+}
+
+impl Drop for Executor {
+    fn drop(&mut self) {
+        if self.owned_bundle {
+            let _ = std::fs::remove_file(&self.schema_path);
+        }
+    }
+}
+
+/// One row of the bound-inputs map. Holds both `role` and `entity` so the
+/// capability check can verify a Set's `path.entity` matches the role's
+/// declared entity (catches uuid-collision and lazy scripts).
+#[derive(Debug, Clone)]
+struct InputBinding {
+    role: String,
+    entity: String,
+}
+
+impl Executor {
+    pub fn load_module(module_dir: impl Into<PathBuf>) -> Result<Self, ExecError> {
+        let module_dir = module_dir.into();
+        let manifest = Manifest::load(&module_dir.join("nsmc.json"))?;
+        manifest.validate(&module_dir)?;
+        let graph = ManifestGraph::build(&manifest)?;
+        let schema_path = build_schema_bundle(&module_dir, &manifest.effective_schemas())?;
+
+        let schema_bundle_bytes = std::fs::read(&schema_path)?;
+        let schema_bundle_hash = compute_schema_bundle_hash(&schema_bundle_bytes);
+        let mut schema_hashes = HashMap::with_capacity(manifest.morphisms.len());
+        for spec in &manifest.morphisms {
+            let script_path = module_dir.join(&spec.script);
+            let hash = compute_morphism_schema_hash(&schema_bundle_bytes, spec, &script_path)?;
+            schema_hashes.insert(spec.name.clone(), hash);
+        }
+
+        Ok(Self {
+            manifest,
+            graph,
+            module_dir,
+            schema_path,
+            rhai: RhaiExecutor::new_sandboxed(),
+            owned_bundle: true,
+            schema_hashes,
+            schema_bundle_hash,
+        })
+    }
+
+    /// Hash for the named morphism in the currently loaded module. `None`
+    /// if no such morphism is declared. Used by `verify_log` to enforce
+    /// the schema-version contract.
+    pub fn schema_hash(&self, morphism: &str) -> Option<[u8; 32]> {
+        self.schema_hashes.get(morphism).copied()
+    }
+
+    /// Single 32-byte hash representing the entire module's schema:
+    /// every morphism's hash, in canonical name order, framed and
+    /// chained. Snapshots pin this so a snapshot taken under bundle A
+    /// can be detected when later loaded against bundle B.
+    pub fn module_schema_hash(&self) -> [u8; 32] {
+        let mut entries: Vec<(&String, &[u8; 32])> = self.schema_hashes.iter().collect();
+        entries.sort_by_key(|(name, _)| name.as_str().to_owned());
+        let mut hasher = Sha256::new();
+        hasher.update(b"nakui-module-v1\0");
+        for (name, hash) in entries {
+            hasher.update((name.len() as u64).to_le_bytes());
+            hasher.update(name.as_bytes());
+            hasher.update(hash);
+        }
+        hasher.finalize().into()
+    }
+
+    /// Compute the ops for a morphism without mutating the store.
+    ///
+    /// Pipeline:
+    ///   1. Resolve manifest spec; bind caller's role->id to spec inputs.
+    ///   2. Reject duplicate ids across roles.
+    ///   3. Load every input entity; KCL pre-check each.
+    ///   4. Run the Rhai script with `{ states, ids, params }`.
+    ///   5. Capability check: every Set targets a tracked id whose entity
+    ///      matches the role's declared entity, and produces a `<role>.<field>`
+    ///      token in `writes`; Create/Delete produce `<entity>` tokens.
+    ///   6. Delta-level invariants (conservation rules).
+    ///   7. Per-input KCL post-check (skipped for inputs that the ops Delete).
+    ///   8. KCL-validate every Created record against its entity schema.
+    ///   9. Pre-apply check: store.apply_dry_run guarantees apply will land.
+    ///
+    /// On `Ok`, the returned ops are *contractually applicable* — caller can
+    /// log first and then apply, knowing apply will succeed barring transient
+    /// backend faults.
+    pub fn compute<S: Store>(
+        &self,
+        store: &S,
+        morphism_name: &str,
+        inputs: &[(&str, Uuid)],
+        params: Value,
+    ) -> Result<Vec<FieldOp>, ExecError> {
+        let spec: &MorphismSpec = self
+            .manifest
+            .morphism(morphism_name)
+            .ok_or_else(|| ExecError::UnknownMorphism(morphism_name.to_string()))?;
+
+        // 1. Bind inputs.
+        let inputs_map: BTreeMap<String, Uuid> = inputs
+            .iter()
+            .map(|(role, id)| (role.to_string(), *id))
+            .collect();
+        for spec_in in &spec.inputs {
+            if !inputs_map.contains_key(&spec_in.role) {
+                return Err(ExecError::MissingInput {
+                    morphism: morphism_name.to_string(),
+                    role: spec_in.role.clone(),
+                });
+            }
+        }
+
+        // 2. Build id -> binding (role + entity), rejecting duplicates.
+        let mut id_to_input: HashMap<Uuid, InputBinding> = HashMap::new();
+        for spec_in in &spec.inputs {
+            let id = inputs_map[&spec_in.role];
+            if let Some(other) = id_to_input.get(&id) {
+                return Err(ExecError::DuplicateInputId {
+                    id,
+                    role_a: other.role.clone(),
+                    role_b: spec_in.role.clone(),
+                });
+            }
+            id_to_input.insert(
+                id,
+                InputBinding {
+                    role: spec_in.role.clone(),
+                    entity: spec_in.entity.clone(),
+                },
+            );
+        }
+
+        // 3. Load + pre-check every input.
+        let mut loaded: BTreeMap<String, Value> = BTreeMap::new();
+        let mut id_strings: BTreeMap<String, String> = BTreeMap::new();
+        for spec_in in &spec.inputs {
+            let id = inputs_map[&spec_in.role];
+            let state = store
+                .load(&spec_in.entity, id)
+                .ok_or_else(|| ExecError::EntityMissing(spec_in.entity.clone(), id))?;
+            self.kcl_check(&spec_in.entity, &state)
+                .map_err(|e| ExecError::KclPre {
+                    role: spec_in.role.clone(),
+                    entity: spec_in.entity.clone(),
+                    source: e,
+                })?;
+            loaded.insert(spec_in.role.clone(), state);
+            id_strings.insert(spec_in.role.clone(), id.to_string());
+        }
+
+        // 4. Rhai.
+        let script_path = self.module_dir.join(&spec.script);
+        let input = json!({
+            "states": loaded,
+            "ids": id_strings,
+            "params": params,
+        });
+        let ops = self.rhai.run(&script_path, input)?;
+
+        // 5. Capability check.
+        let declared: HashSet<&str> = spec.writes.iter().map(String::as_str).collect();
+        for op in &ops {
+            let token = match op {
+                FieldOp::Set { path, .. } => match id_to_input.get(&path.id) {
+                    Some(binding) if binding.entity == path.entity => {
+                        format!("{}.{}", binding.role, path.field)
+                    }
+                    Some(_) => {
+                        return Err(ExecError::CapabilityViolation {
+                            morphism: morphism_name.to_string(),
+                            token: format!(
+                                "<entity-mismatch>.{}.{}",
+                                path.entity, path.field
+                            ),
+                            declared: spec.writes.clone(),
+                        });
+                    }
+                    None => {
+                        return Err(ExecError::CapabilityViolation {
+                            morphism: morphism_name.to_string(),
+                            token: format!("<untracked id>.{}.{}", path.entity, path.field),
+                            declared: spec.writes.clone(),
+                        });
+                    }
+                },
+                FieldOp::Create { entity, .. } => entity.clone(),
+                FieldOp::Delete { entity, .. } => entity.clone(),
+            };
+            if !declared.contains(token.as_str()) {
+                return Err(ExecError::CapabilityViolation {
+                    morphism: morphism_name.to_string(),
+                    token,
+                    declared: spec.writes.clone(),
+                });
+            }
+        }
+
+        // 6. Conservation invariants.
+        for rule in &spec.invariants.conserve {
+            check_conservation(rule, &loaded, &id_to_input, &ops)?;
+        }
+
+        // 7. Per-input KCL post-check; skip Deleted inputs.
+        for spec_in in &spec.inputs {
+            let id = inputs_map[&spec_in.role];
+            if let Some(new_state) =
+                simulate_on(&loaded[&spec_in.role], &spec_in.entity, id, &ops)
+            {
+                self.kcl_check(&spec_in.entity, &new_state)
+                    .map_err(|e| ExecError::KclPost {
+                        role: spec_in.role.clone(),
+                        entity: spec_in.entity.clone(),
+                        source: e,
+                    })?;
+            }
+        }
+
+        // 8. Validate every Created record against its entity schema.
+        for op in &ops {
+            if let FieldOp::Create { entity, id, data } = op {
+                self.kcl_check(entity, data)
+                    .map_err(|e| ExecError::KclPostCreate {
+                        entity: entity.clone(),
+                        id: *id,
+                        source: e,
+                    })?;
+            }
+        }
+
+        // 9. Pre-apply check: structural compatibility with current store state.
+        store.apply_dry_run(&ops)?;
+
+        Ok(ops)
+    }
+
+    /// compute + apply, for callers that don't need event logging.
+    pub fn run<S: Store>(
+        &self,
+        store: &mut S,
+        morphism_name: &str,
+        inputs: &[(&str, Uuid)],
+        params: Value,
+    ) -> Result<Vec<FieldOp>, ExecError> {
+        let ops = self.compute(store, morphism_name, inputs, params)?;
+        store.apply(&ops)?;
+        Ok(ops)
+    }
+
+    fn kcl_check(&self, entity: &str, state: &Value) -> Result<(), KclError> {
+        let tmp = std::env::temp_dir().join(format!("nakui_{}_{}.json", entity, Uuid::new_v4()));
+        std::fs::write(&tmp, serde_json::to_vec(state).expect("state serializes"))
+            .map_err(KclError::Io)?;
+        let result = kcl_wrapper::vet(&self.schema_path, &tmp, entity);
+        let _ = std::fs::remove_file(&tmp);
+        result
+    }
+}
+
+/// Concatenate every declared `.k` file into a single bundle on disk.
+/// `kcl vet` only takes one schema arg, so cross-module modules (e.g. sales
+/// referencing both treasury and inventory entities) bundle their imports
+/// at load time. The bundle lives in `temp_dir` for the lifetime of the
+/// executor; one file per Executor instance.
+/// Module-wide hash of just the KCL bundle bytes. Stamped on
+/// `LogEntry::Seed` entries (which don't run through any morphism, so
+/// `compute_morphism_schema_hash` doesn't apply). Bumped by any byte
+/// change in any schema file the manifest exposes — coarser than a
+/// per-entity hash would be, but doesn't require KCL parsing.
+fn compute_schema_bundle_hash(schema_bundle_bytes: &[u8]) -> [u8; 32] {
+    let mut hasher = Sha256::new();
+    hasher.update(b"nakui-bundle-v1\0");
+    hasher.update((schema_bundle_bytes.len() as u64).to_le_bytes());
+    hasher.update(schema_bundle_bytes);
+    hasher.finalize().into()
+}
+
+/// Per-morphism schema hash. SHA-256 with length-prefixed framing over
+/// three inputs that together determine the morphism's deterministic
+/// behaviour: the KCL schema bundle (entity shapes + invariants), the
+/// manifest spec (writes, conserve, depends_on, etc.), and a
+/// **normalized** form of the Rhai script — comments stripped and
+/// whitespace runs collapsed, with string literals preserved exactly.
+///
+/// The normalization makes the hash invariant to cosmetic edits (a
+/// developer adding a `// TODO` doesn't invalidate the log) without
+/// missing real behavioural changes. The framing tag is bumped to
+/// `nakui-schema-v2` so logs hashed under v1 (raw bytes) cleanly fail
+/// SchemaMismatch on upgrade rather than silently divergence.
+fn compute_morphism_schema_hash(
+    schema_bundle_bytes: &[u8],
+    spec: &MorphismSpec,
+    script_path: &Path,
+) -> std::io::Result<[u8; 32]> {
+    let script_bytes = std::fs::read(script_path)?;
+    let script_source = std::str::from_utf8(&script_bytes).map_err(|e| {
+        std::io::Error::new(
+            std::io::ErrorKind::InvalidData,
+            format!("script {} is not valid UTF-8: {}", script_path.display(), e),
+        )
+    })?;
+    let normalized_script = normalize_rhai_source(script_source);
+    let spec_json = serde_json::to_vec(spec).expect("MorphismSpec serializes");
+
+    let mut hasher = Sha256::new();
+    hasher.update(b"nakui-schema-v2\0");
+    hasher.update(b"schema:");
+    hasher.update((schema_bundle_bytes.len() as u64).to_le_bytes());
+    hasher.update(schema_bundle_bytes);
+    hasher.update(b"spec:");
+    hasher.update((spec_json.len() as u64).to_le_bytes());
+    hasher.update(&spec_json);
+    hasher.update(b"script:");
+    hasher.update((normalized_script.len() as u64).to_le_bytes());
+    hasher.update(normalized_script.as_bytes());
+    Ok(hasher.finalize().into())
+}
+
+/// Strip line/block comments and collapse whitespace runs in a Rhai
+/// source string. Preserves string literals exactly. Used to make the
+/// schema hash invariant to cosmetic edits.
+///
+/// Limitations:
+///   - Doesn't handle backtick template literals (Rhai 1.x interp
+///     strings). If the modules ever start using them, the normalizer
+///     must be extended; until then it's not a concern for the
+///     production scripts in `modules/`.
+///   - Doesn't handle nested block comments — Rhai itself doesn't
+///     either.
+pub fn normalize_rhai_source(src: &str) -> String {
+    let mut out = String::with_capacity(src.len());
+    let mut chars = src.chars().peekable();
+    let mut prev_was_space = true; // strip leading whitespace
+
+    while let Some(c) = chars.next() {
+        // Line comment: //...\n
+        if c == '/' && chars.peek() == Some(&'/') {
+            chars.next();
+            while let Some(&n) = chars.peek() {
+                if n == '\n' {
+                    break;
+                }
+                chars.next();
+            }
+            continue;
+        }
+        // Block comment: /* ... */
+        if c == '/' && chars.peek() == Some(&'*') {
+            chars.next();
+            let mut prev = '\0';
+            while let Some(n) = chars.next() {
+                if prev == '*' && n == '/' {
+                    break;
+                }
+                prev = n;
+            }
+            continue;
+        }
+        // String literal: copy verbatim including escape sequences.
+        if c == '"' {
+            out.push('"');
+            while let Some(n) = chars.next() {
+                if n == '\\' {
+                    out.push('\\');
+                    if let Some(esc) = chars.next() {
+                        out.push(esc);
+                    }
+                } else if n == '"' {
+                    out.push('"');
+                    break;
+                } else {
+                    out.push(n);
+                }
+            }
+            prev_was_space = false;
+            continue;
+        }
+        // Whitespace run → single space (or nothing if at edge).
+        if c.is_whitespace() {
+            if !prev_was_space {
+                out.push(' ');
+                prev_was_space = true;
+            }
+            continue;
+        }
+        // Regular character.
+        out.push(c);
+        prev_was_space = false;
+    }
+
+    if out.ends_with(' ') {
+        out.pop();
+    }
+    out
+}
+
+fn build_schema_bundle(module_dir: &std::path::Path, schemas: &[String]) -> std::io::Result<PathBuf> {
+    let mut combined = String::new();
+    for s in schemas {
+        let p = module_dir.join(s);
+        let content = std::fs::read_to_string(&p)?;
+        combined.push_str("# --- ");
+        combined.push_str(p.to_string_lossy().as_ref());
+        combined.push_str(" ---\n");
+        combined.push_str(&content);
+        combined.push_str("\n\n");
+    }
+    let bundle = std::env::temp_dir().join(format!("nakui_schema_{}.k", Uuid::new_v4()));
+    std::fs::write(&bundle, combined)?;
+    Ok(bundle)
+}
+
+fn check_conservation(
+    rule: &ConserveRule,
+    loaded: &BTreeMap<String, Value>,
+    id_to_input: &HashMap<Uuid, InputBinding>,
+    ops: &[FieldOp],
+) -> Result<(), ExecError> {
+    let mut delta_by_group: HashMap<String, i128> = HashMap::new();
+
+    for op in ops {
+        if let FieldOp::Set { path, value } = op {
+            if path.entity != rule.entity || path.field != rule.field {
+                continue;
+            }
+            let binding = id_to_input
+                .get(&path.id)
+                .filter(|b| b.entity == path.entity)
+                .ok_or_else(|| ExecError::ConservationMalformed {
+                    entity: rule.entity.clone(),
+                    field: rule.field.clone(),
+                    message: format!(
+                        "Set on id {} with entity {} cannot be reconciled to a tracked input",
+                        path.id, path.entity
+                    ),
+                })?;
+            let old_state = &loaded[&binding.role];
+            let old_val =
+                old_state
+                    .get(&rule.field)
+                    .and_then(Value::as_i64)
+                    .ok_or_else(|| ExecError::ConservationMalformed {
+                        entity: rule.entity.clone(),
+                        field: rule.field.clone(),
+                        message: format!("old value at role `{}` is not i64", binding.role),
+                    })?;
+            let new_val =
+                value
+                    .as_i64()
+                    .ok_or_else(|| ExecError::ConservationMalformed {
+                        entity: rule.entity.clone(),
+                        field: rule.field.clone(),
+                        message: format!("Set value at role `{}` is not i64", binding.role),
+                    })?;
+            let group_key = match &rule.group_by {
+                Some(g) => old_state
+                    .get(g)
+                    .and_then(Value::as_str)
+                    .unwrap_or("")
+                    .to_string(),
+                None => String::new(),
+            };
+            *delta_by_group.entry(group_key).or_insert(0) +=
+                (new_val as i128) - (old_val as i128);
+        }
+    }
+
+    for (group, total) in &delta_by_group {
+        if *total != 0 {
+            return Err(ExecError::ConservationViolation {
+                entity: rule.entity.clone(),
+                field: rule.field.clone(),
+                group_by: rule.group_by.clone().unwrap_or_else(|| "(global)".into()),
+                group: group.clone(),
+                total: *total,
+            });
+        }
+    }
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn normalize_strips_line_and_block_comments() {
+        let src = r#"
+// header comment
+let x = 1; // trailing
+/* block
+   spans lines */
+let y = 2;
+"#;
+        let normalized = normalize_rhai_source(src);
+        assert_eq!(normalized, "let x = 1; let y = 2;");
+    }
+
+    #[test]
+    fn normalize_collapses_whitespace_runs() {
+        let src = "let     a  =\t\t1;\n\n\n\nlet b   =   2;";
+        let normalized = normalize_rhai_source(src);
+        assert_eq!(normalized, "let a = 1; let b = 2;");
+    }
+
+    #[test]
+    fn normalize_preserves_strings_verbatim_including_double_spaces() {
+        // The double space, the // inside, and the escape are preserved
+        // exactly because they're inside a string literal — semantic
+        // content, not cosmetic.
+        let src = r#"let s = "hello  // not a comment \"world\"";"#;
+        let normalized = normalize_rhai_source(src);
+        assert_eq!(normalized, r#"let s = "hello  // not a comment \"world\"";"#);
+    }
+
+    #[test]
+    fn normalize_is_idempotent() {
+        let src = "// a\nlet x  =  1;\n";
+        let n1 = normalize_rhai_source(src);
+        let n2 = normalize_rhai_source(&n1);
+        assert_eq!(n1, n2);
+    }
+
+    #[test]
+    fn normalize_distinguishes_real_changes() {
+        // Adding a new statement is a non-cosmetic change — the
+        // normalized output must reflect it.
+        let a = "let x = 1;";
+        let b = "let x = 1; let y = 2;";
+        assert_ne!(normalize_rhai_source(a), normalize_rhai_source(b));
+
+        // Same for changing a literal value.
+        let c = "let x = 1;";
+        let d = "let x = 2;";
+        assert_ne!(normalize_rhai_source(c), normalize_rhai_source(d));
+    }
+
+    #[test]
+    fn normalize_handles_comment_at_end_without_newline() {
+        let src = "let x = 1; // no trailing newline";
+        let normalized = normalize_rhai_source(src);
+        assert_eq!(normalized, "let x = 1;");
+    }
+
+    #[test]
+    fn normalize_handles_unterminated_block_comment() {
+        // Defensive: if someone writes `/* ...` and forgets to close,
+        // we don't infinite-loop or panic. The trailing content is
+        // discarded, which is fine — Rhai won't parse this either.
+        let src = "let x = 1; /* never ends";
+        let normalized = normalize_rhai_source(src);
+        assert_eq!(normalized, "let x = 1;");
+    }
+}
diff --git a/crates/modules/nakui/core/src/graph.rs b/crates/modules/nakui/core/src/graph.rs
new file mode 100644
index 0000000..21dece5
--- /dev/null
+++ b/crates/modules/nakui/core/src/graph.rs
@@ -0,0 +1,277 @@
+//! Static dependency graph derived from a `Manifest`.
+//!
+//! Two graphs in one structure:
+//!   - **Explicit graph** (`depends_on`): morphism-to-morphism edges declared
+//!     by the manifest author. Cycles here are an error — the graph is built
+//!     with cycle detection.
+//!   - **Data-flow indexes** (`reads`/`writes`): inverted indexes from
+//!     canonical entity tokens (`"Caja.saldo"` or `"Movimiento"`) to the
+//!     morphisms that read or write them. Self-loops in data flow are
+//!     legal (a morphism that reads a field and updates it is normal).
+//!
+//! Tokens are normalized at build time: a manifest's role-prefixed tokens
+//! (`"caja.saldo"`) become entity-prefixed (`"Caja.saldo"`) so cross-module
+//! queries work uniformly.
+
+use petgraph::algo::tarjan_scc;
+use petgraph::graph::{DiGraph, NodeIndex};
+use petgraph::visit::Topo;
+use std::collections::{HashMap, HashSet};
+use thiserror::Error;
+
+use crate::manifest::Manifest;
+
+#[derive(Debug, Error)]
+pub enum GraphError {
+    #[error("dependency cycle in `depends_on` involving morphisms {0:?}")]
+    Cycle(Vec<String>),
+    #[error("morphism `{0}` referenced in depends_on but not declared in this manifest")]
+    UnknownMorphism(String),
+}
+
+#[derive(Debug)]
+pub struct ManifestGraph {
+    /// Explicit `depends_on` graph. Edge `a -> b` means: morphism `b`
+    /// depends on `a`, so `a` must be available before `b`.
+    explicit: DiGraph<String, ()>,
+
+    /// Data-flow indexes. Token form: "Entity.field" or "Entity".
+    readers_of_token: HashMap<String, Vec<String>>,
+    writers_of_token: HashMap<String, Vec<String>>,
+
+    /// Per-morphism canonicalized token sets.
+    morphism_reads: HashMap<String, Vec<String>>,
+    morphism_writes: HashMap<String, Vec<String>>,
+}
+
+impl ManifestGraph {
+    pub fn build(manifest: &Manifest) -> Result<Self, GraphError> {
+        let explicit = build_explicit(manifest)?;
+        if let Some(cycle) = find_cycle(&explicit) {
+            return Err(GraphError::Cycle(cycle));
+        }
+        let (readers_of_token, writers_of_token, morphism_reads, morphism_writes) =
+            build_data_flow(manifest);
+        Ok(Self {
+            explicit,
+            readers_of_token,
+            writers_of_token,
+            morphism_reads,
+            morphism_writes,
+        })
+    }
+
+    /// Morphisms that read `token`. Token form: "Entity.field" or "Entity".
+    pub fn readers_of(&self, token: &str) -> &[String] {
+        self.readers_of_token
+            .get(token)
+            .map(|v| v.as_slice())
+            .unwrap_or(&[])
+    }
+
+    /// Morphisms that write `token`.
+    pub fn writers_of(&self, token: &str) -> &[String] {
+        self.writers_of_token
+            .get(token)
+            .map(|v| v.as_slice())
+            .unwrap_or(&[])
+    }
+
+    pub fn morphism_reads(&self, name: &str) -> &[String] {
+        self.morphism_reads
+            .get(name)
+            .map(|v| v.as_slice())
+            .unwrap_or(&[])
+    }
+
+    pub fn morphism_writes(&self, name: &str) -> &[String] {
+        self.morphism_writes
+            .get(name)
+            .map(|v| v.as_slice())
+            .unwrap_or(&[])
+    }
+
+    /// Morphisms whose `reads` overlap any of `name`'s `writes`. The
+    /// dirty-marking primitive: after `name` runs successfully, these are
+    /// the candidates whose derived state would be invalidated. The result
+    /// excludes `name` itself even if it reads what it writes.
+    pub fn affected_by(&self, name: &str) -> Vec<String> {
+        let writes = match self.morphism_writes.get(name) {
+            Some(w) => w,
+            None => return Vec::new(),
+        };
+        let mut affected: HashSet<String> = HashSet::new();
+        for token in writes {
+            if let Some(readers) = self.readers_of_token.get(token) {
+                for r in readers {
+                    if r != name {
+                        affected.insert(r.clone());
+                    }
+                }
+            }
+        }
+        let mut out: Vec<_> = affected.into_iter().collect();
+        out.sort();
+        out
+    }
+
+    /// Topological order of the explicit dependency graph. If `a` is in
+    /// `b.depends_on`, `a` precedes `b` in the result.
+    pub fn topological_order(&self) -> Vec<String> {
+        let mut topo = Topo::new(&self.explicit);
+        let mut out = Vec::new();
+        while let Some(idx) = topo.next(&self.explicit) {
+            out.push(self.explicit[idx].clone());
+        }
+        out
+    }
+}
+
+fn build_explicit(manifest: &Manifest) -> Result<DiGraph<String, ()>, GraphError> {
+    let mut graph = DiGraph::new();
+    let mut nodes: HashMap<String, NodeIndex> = HashMap::new();
+    for m in &manifest.morphisms {
+        let idx = graph.add_node(m.name.clone());
+        nodes.insert(m.name.clone(), idx);
+    }
+    for m in &manifest.morphisms {
+        let to = nodes[&m.name];
+        for dep in &m.depends_on {
+            let from = *nodes
+                .get(dep)
+                .ok_or_else(|| GraphError::UnknownMorphism(dep.clone()))?;
+            graph.add_edge(from, to, ());
+        }
+    }
+    Ok(graph)
+}
+
+/// Returns one cycle's nodes (sorted) if the graph has any. Self-loops
+/// are returned as `[name]`; multi-node SCCs as the SCC's nodes.
+fn find_cycle(graph: &DiGraph<String, ()>) -> Option<Vec<String>> {
+    for scc in tarjan_scc(graph) {
+        if scc.len() > 1 {
+            let mut names: Vec<String> = scc.iter().map(|i| graph[*i].clone()).collect();
+            names.sort();
+            return Some(names);
+        }
+        if scc.len() == 1 && graph.find_edge(scc[0], scc[0]).is_some() {
+            return Some(vec![graph[scc[0]].clone()]);
+        }
+    }
+    None
+}
+
+fn build_data_flow(
+    manifest: &Manifest,
+) -> (
+    HashMap<String, Vec<String>>,
+    HashMap<String, Vec<String>>,
+    HashMap<String, Vec<String>>,
+    HashMap<String, Vec<String>>,
+) {
+    let mut readers: HashMap<String, Vec<String>> = HashMap::new();
+    let mut writers: HashMap<String, Vec<String>> = HashMap::new();
+    let mut m_reads: HashMap<String, Vec<String>> = HashMap::new();
+    let mut m_writes: HashMap<String, Vec<String>> = HashMap::new();
+
+    for m in &manifest.morphisms {
+        let role_to_entity: HashMap<&str, &str> = m
+            .inputs
+            .iter()
+            .map(|i| (i.role.as_str(), i.entity.as_str()))
+            .collect();
+
+        // Dedupe per-morphism: `source.saldo` and `dest.saldo` both
+        // canonicalize to `Caja.saldo` — the morphism is one writer, not
+        // two.
+        let mut seen_reads: HashSet<String> = HashSet::new();
+        for r in &m.reads {
+            if let Some(token) = canonicalize_token(r, &role_to_entity) {
+                if seen_reads.insert(token.clone()) {
+                    readers.entry(token.clone()).or_default().push(m.name.clone());
+                    m_reads.entry(m.name.clone()).or_default().push(token);
+                }
+            }
+        }
+        let mut seen_writes: HashSet<String> = HashSet::new();
+        for w in &m.writes {
+            if let Some(token) = canonicalize_token(w, &role_to_entity) {
+                if seen_writes.insert(token.clone()) {
+                    writers.entry(token.clone()).or_default().push(m.name.clone());
+                    m_writes.entry(m.name.clone()).or_default().push(token);
+                }
+            }
+        }
+    }
+
+    (readers, writers, m_reads, m_writes)
+}
+
+/// "role.field" -> "Entity.field" via the inputs map; "Entity" -> "Entity".
+fn canonicalize_token(t: &str, roles: &HashMap<&str, &str>) -> Option<String> {
+    if let Some((role, field)) = t.split_once('.') {
+        roles
+            .get(role)
+            .map(|entity| format!("{}.{}", entity, field))
+    } else {
+        Some(t.to_string())
+    }
+}
+
+/// Tracks which morphisms have stale derived state because some morphism
+/// they read from was applied. Wire it next to your `execute_and_log`
+/// loop: after a successful run, call `mark_dirty_after(morphism, &graph)`;
+/// then any consumer (cached view, derived report, downstream pipeline)
+/// queries `is_dirty(name)` before using its cached output.
+///
+/// The tracker holds names only — it doesn't know what "recompute" means
+/// for any particular morphism. That's deliberate: the kernel exposes the
+/// invalidation primitive; what to do with the dirty set is the caller's.
+#[derive(Debug, Default, Clone)]
+pub struct DirtyTracker {
+    dirty: HashSet<String>,
+}
+
+impl DirtyTracker {
+    pub fn new() -> Self {
+        Self::default()
+    }
+
+    /// After `morphism_name` runs successfully, mark every morphism in
+    /// `graph.affected_by(morphism_name)` as dirty.
+    pub fn mark_dirty_after(&mut self, morphism_name: &str, graph: &ManifestGraph) {
+        for affected in graph.affected_by(morphism_name) {
+            self.dirty.insert(affected);
+        }
+    }
+
+    pub fn is_dirty(&self, morphism: &str) -> bool {
+        self.dirty.contains(morphism)
+    }
+
+    /// Sorted list of dirty morphisms. Stable order for UI/telemetry.
+    pub fn dirty(&self) -> Vec<String> {
+        let mut out: Vec<String> = self.dirty.iter().cloned().collect();
+        out.sort();
+        out
+    }
+
+    pub fn len(&self) -> usize {
+        self.dirty.len()
+    }
+
+    pub fn is_empty(&self) -> bool {
+        self.dirty.is_empty()
+    }
+
+    /// Clear the dirty flag for a specific morphism (call after the
+    /// caller has recomputed it).
+    pub fn clear(&mut self, morphism: &str) {
+        self.dirty.remove(morphism);
+    }
+
+    pub fn clear_all(&mut self) {
+        self.dirty.clear();
+    }
+}
diff --git a/crates/modules/nakui/core/src/kcl_wrapper.rs b/crates/modules/nakui/core/src/kcl_wrapper.rs
new file mode 100644
index 0000000..94e890a
--- /dev/null
+++ b/crates/modules/nakui/core/src/kcl_wrapper.rs
@@ -0,0 +1,43 @@
+use std::path::Path;
+use std::process::Command;
+use thiserror::Error;
+
+#[derive(Debug, Error)]
+pub enum KclError {
+    #[error("kcl binary not found on PATH (install: https://kcl-lang.io)")]
+    BinaryMissing,
+    #[error("kcl validation failed:\n{0}")]
+    ValidationFailed(String),
+    #[error("io invoking kcl: {0}")]
+    Io(#[from] std::io::Error),
+}
+
+/// Validate `state_path` (json) against a schema defined in `schema_path` (.k),
+/// targeting the named schema.
+pub fn vet(schema_path: &Path, state_path: &Path, schema_name: &str) -> Result<(), KclError> {
+    let out = match Command::new("kcl")
+        .arg("vet")
+        .arg(state_path)
+        .arg(schema_path)
+        .arg("-s")
+        .arg(schema_name)
+        .output()
+    {
+        Ok(o) => o,
+        Err(e) if e.kind() == std::io::ErrorKind::NotFound => return Err(KclError::BinaryMissing),
+        Err(e) => return Err(e.into()),
+    };
+
+    if out.status.success() {
+        Ok(())
+    } else {
+        let stderr = String::from_utf8_lossy(&out.stderr).into_owned();
+        let stdout = String::from_utf8_lossy(&out.stdout).into_owned();
+        let msg = if stderr.trim().is_empty() {
+            stdout
+        } else {
+            stderr
+        };
+        Err(KclError::ValidationFailed(msg))
+    }
+}
diff --git a/crates/modules/nakui/core/src/lib.rs b/crates/modules/nakui/core/src/lib.rs
new file mode 100644
index 0000000..e2353de
--- /dev/null
+++ b/crates/modules/nakui/core/src/lib.rs
@@ -0,0 +1,11 @@
+pub mod delta;
+pub mod drift;
+pub mod event_log;
+pub mod executor;
+pub mod graph;
+pub mod kcl_wrapper;
+pub mod manifest;
+pub mod rhai_executor;
+pub mod run;
+pub mod store;
+pub mod surreal_store;
diff --git a/crates/modules/nakui/core/src/manifest.rs b/crates/modules/nakui/core/src/manifest.rs
new file mode 100644
index 0000000..dda56e6
--- /dev/null
+++ b/crates/modules/nakui/core/src/manifest.rs
@@ -0,0 +1,306 @@
+use serde::{Deserialize, Serialize};
+use std::collections::{HashMap, HashSet};
+use std::path::Path;
+use thiserror::Error;
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Manifest {
+    pub module: String,
+    /// Schema files that compose this module's KCL surface. Paths are
+    /// resolved relative to the module directory; cross-module references
+    /// use `"../other_module/schema.k"`. Defaults to `["schema.k"]` when
+    /// the field is absent — the single-file case.
+    #[serde(default)]
+    pub schemas: Vec<String>,
+    pub morphisms: Vec<MorphismSpec>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct MorphismSpec {
+    pub name: String,
+    pub inputs: Vec<MorphismInput>,
+    pub reads: Vec<String>,
+    pub writes: Vec<String>,
+    #[serde(default)]
+    pub invariants: Invariants,
+    #[serde(default)]
+    pub depends_on: Vec<String>,
+    pub script: String,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct MorphismInput {
+    pub role: String,
+    pub entity: String,
+}
+
+#[derive(Debug, Clone, Default, Serialize, Deserialize)]
+pub struct Invariants {
+    /// Sum-conservation rules. The total Δ of (entity, field) across the ops
+    /// produced by the morphism must be zero — optionally bucketed by another
+    /// field on the entity (e.g. group_by="currency" so USD and EUR are
+    /// independent ledgers).
+    #[serde(default)]
+    pub conserve: Vec<ConserveRule>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ConserveRule {
+    pub entity: String,
+    pub field: String,
+    #[serde(default)]
+    pub group_by: Option<String>,
+}
+
+#[derive(Debug, Error)]
+pub enum ManifestError {
+    #[error("io reading manifest: {0}")]
+    Io(#[from] std::io::Error),
+    #[error("parsing manifest json: {0}")]
+    Parse(#[from] serde_json::Error),
+}
+
+/// Errors raised by `Manifest::validate`. Each variant flags a specific
+/// semantic issue caught before the kernel ever runs the module — these
+/// are the contract between manifest authors (humans or AI) and Nakui.
+#[derive(Debug, Error)]
+pub enum ValidationError {
+    #[error("morphism name `{0}` declared more than once")]
+    DuplicateMorphism(String),
+    #[error("morphism `{morphism}`: input role `{role}` declared more than once")]
+    DuplicateRole { morphism: String, role: String },
+    #[error(
+        "morphism `{morphism}`: input entity `{entity}` is not declared in any schema file (known: {known:?})"
+    )]
+    InputUnknownEntity {
+        morphism: String,
+        entity: String,
+        known: Vec<String>,
+    },
+    #[error(
+        "morphism `{morphism}`: writes token `{token}` references unknown role `{role}` (declared roles: {roles:?})"
+    )]
+    WritesUnknownRole {
+        morphism: String,
+        token: String,
+        role: String,
+        roles: Vec<String>,
+    },
+    #[error(
+        "morphism `{morphism}`: writes token `{token}` is not a declared role.field nor a known entity name"
+    )]
+    WritesUnknownEntity { morphism: String, token: String },
+    #[error("morphism `{morphism}`: conserve rule references unknown entity `{entity}`")]
+    ConserveUnknownEntity { morphism: String, entity: String },
+    #[error("morphism `{morphism}`: depends_on `{dep}` does not name a morphism in this manifest")]
+    DependsOnUnknown { morphism: String, dep: String },
+    #[error("morphism `{morphism}`: script file `{script}` not found at {resolved}")]
+    ScriptMissing {
+        morphism: String,
+        script: String,
+        resolved: String,
+    },
+    #[error("schema file `{path}` declared in manifest does not exist at {resolved}")]
+    SchemaFileMissing { path: String, resolved: String },
+    #[error("schema name `{name}` is declared in multiple files: {files:?}")]
+    DuplicateSchema { name: String, files: Vec<String> },
+    #[error("io reading schema `{path}`: {source}")]
+    Io {
+        path: String,
+        #[source]
+        source: std::io::Error,
+    },
+}
+
+impl Manifest {
+    pub fn load(path: &Path) -> Result<Self, ManifestError> {
+        let text = std::fs::read_to_string(path)?;
+        let m: Self = serde_json::from_str(&text)?;
+        Ok(m)
+    }
+
+    pub fn morphism(&self, name: &str) -> Option<&MorphismSpec> {
+        self.morphisms.iter().find(|m| m.name == name)
+    }
+
+    /// Schema files this module exposes. Defaults to `["schema.k"]` when
+    /// the manifest doesn't declare any explicitly.
+    pub fn effective_schemas(&self) -> Vec<String> {
+        if self.schemas.is_empty() {
+            vec!["schema.k".to_string()]
+        } else {
+            self.schemas.clone()
+        }
+    }
+
+    /// Run all semantic checks. Catches author errors that would otherwise
+    /// surface as opaque runtime failures — misspelled entity names that
+    /// silently make conservation a no-op, role typos in writes that allow
+    /// any op through, unresolvable script paths, etc.
+    pub fn validate(&self, module_dir: &Path) -> Result<(), ValidationError> {
+        // 1. Resolve schemas: read each file, parse schema names, detect
+        //    cross-file duplicates. Build the set of known entity names.
+        let mut entity_to_files: HashMap<String, Vec<String>> = HashMap::new();
+        for s in self.effective_schemas() {
+            let resolved = module_dir.join(&s);
+            if !resolved.exists() {
+                return Err(ValidationError::SchemaFileMissing {
+                    path: s.clone(),
+                    resolved: resolved.display().to_string(),
+                });
+            }
+            let content = std::fs::read_to_string(&resolved).map_err(|e| {
+                ValidationError::Io {
+                    path: s.clone(),
+                    source: e,
+                }
+            })?;
+            for name in extract_schema_names(&content) {
+                entity_to_files.entry(name).or_default().push(s.clone());
+            }
+        }
+        for (name, files) in &entity_to_files {
+            if files.len() > 1 {
+                return Err(ValidationError::DuplicateSchema {
+                    name: name.clone(),
+                    files: files.clone(),
+                });
+            }
+        }
+        let known_entities: HashSet<&str> =
+            entity_to_files.keys().map(String::as_str).collect();
+
+        // 2. Manifest-level: morphism names must be unique.
+        let mut seen: HashSet<&str> = HashSet::new();
+        for m in &self.morphisms {
+            if !seen.insert(m.name.as_str()) {
+                return Err(ValidationError::DuplicateMorphism(m.name.clone()));
+            }
+        }
+        let known_morphisms: HashSet<&str> =
+            self.morphisms.iter().map(|m| m.name.as_str()).collect();
+
+        // 3. Per-morphism checks.
+        for m in &self.morphisms {
+            let mut roles: HashSet<&str> = HashSet::new();
+            for inp in &m.inputs {
+                if !roles.insert(inp.role.as_str()) {
+                    return Err(ValidationError::DuplicateRole {
+                        morphism: m.name.clone(),
+                        role: inp.role.clone(),
+                    });
+                }
+                if !known_entities.contains(inp.entity.as_str()) {
+                    return Err(ValidationError::InputUnknownEntity {
+                        morphism: m.name.clone(),
+                        entity: inp.entity.clone(),
+                        known: sorted(&known_entities),
+                    });
+                }
+            }
+
+            for token in &m.writes {
+                if let Some((role, _field)) = token.split_once('.') {
+                    if !roles.contains(role) {
+                        return Err(ValidationError::WritesUnknownRole {
+                            morphism: m.name.clone(),
+                            token: token.clone(),
+                            role: role.to_string(),
+                            roles: m.inputs.iter().map(|i| i.role.clone()).collect(),
+                        });
+                    }
+                } else if !known_entities.contains(token.as_str()) {
+                    return Err(ValidationError::WritesUnknownEntity {
+                        morphism: m.name.clone(),
+                        token: token.clone(),
+                    });
+                }
+            }
+
+            for rule in &m.invariants.conserve {
+                if !known_entities.contains(rule.entity.as_str()) {
+                    return Err(ValidationError::ConserveUnknownEntity {
+                        morphism: m.name.clone(),
+                        entity: rule.entity.clone(),
+                    });
+                }
+            }
+
+            for dep in &m.depends_on {
+                if !known_morphisms.contains(dep.as_str()) {
+                    return Err(ValidationError::DependsOnUnknown {
+                        morphism: m.name.clone(),
+                        dep: dep.clone(),
+                    });
+                }
+            }
+
+            let script_resolved = module_dir.join(&m.script);
+            if !script_resolved.exists() {
+                return Err(ValidationError::ScriptMissing {
+                    morphism: m.name.clone(),
+                    script: m.script.clone(),
+                    resolved: script_resolved.display().to_string(),
+                });
+            }
+        }
+
+        Ok(())
+    }
+}
+
+/// Cheap line-scan over a `.k` file to extract every `schema NAME` declared
+/// at column 0 (top-level). Tolerates inheritance (`schema X(Y):`) and
+/// generic params (`schema X[T]:`); ignores comments and string literals
+/// because top-level KCL syntax doesn't admit them ambiguously.
+fn extract_schema_names(content: &str) -> Vec<String> {
+    let mut out = Vec::new();
+    for line in content.lines() {
+        // Top-level declarations are not indented in idiomatic KCL.
+        if line.starts_with("schema ") {
+            let after = &line["schema ".len()..];
+            let name: String = after
+                .chars()
+                .take_while(|c| c.is_alphanumeric() || *c == '_')
+                .collect();
+            if !name.is_empty() {
+                out.push(name);
+            }
+        }
+    }
+    out
+}
+
+fn sorted(set: &HashSet<&str>) -> Vec<String> {
+    let mut v: Vec<String> = set.iter().map(|s| s.to_string()).collect();
+    v.sort();
+    v
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn extract_schema_names_handles_basic_forms() {
+        let content = r#"
+schema Caja:
+    saldo: int
+
+schema Movimiento(Base):
+    monto: int
+
+# schema Comentario:
+schema Generic[T]:
+    inner: T
+
+schema _Underscore:
+    x: int
+"#;
+        let names = extract_schema_names(content);
+        assert_eq!(
+            names,
+            vec!["Caja", "Movimiento", "Generic", "_Underscore"]
+        );
+    }
+}
diff --git a/crates/modules/nakui/core/src/rhai_executor.rs b/crates/modules/nakui/core/src/rhai_executor.rs
new file mode 100644
index 0000000..be41439
--- /dev/null
+++ b/crates/modules/nakui/core/src/rhai_executor.rs
@@ -0,0 +1,103 @@
+use rhai::packages::{
+    ArithmeticPackage, BasicArrayPackage, BasicIteratorPackage, BasicMapPackage,
+    BasicStringPackage, CorePackage, LogicPackage, Package,
+};
+use rhai::{AST, Dynamic, Engine, Scope};
+use serde_json::Value;
+use std::cell::RefCell;
+use std::collections::HashMap;
+use std::path::{Path, PathBuf};
+use std::sync::Arc;
+use thiserror::Error;
+
+use crate::delta::FieldOp;
+
+#[derive(Debug, Error)]
+pub enum RhaiError {
+    #[error("compile error: {0}")]
+    Compile(String),
+    #[error("runtime error: {0}")]
+    Runtime(String),
+    #[error("morphism returned non-array")]
+    BadDelta,
+    #[error("delta op malformed: {0}")]
+    BadOp(String),
+    #[error("io reading script: {0}")]
+    Io(#[from] std::io::Error),
+}
+
+pub struct RhaiExecutor {
+    engine: Engine,
+    /// Compiled-AST cache keyed by absolute script path. Avoids reading +
+    /// reparsing on every call (verify_log re-runs every morphism in the
+    /// log; without the cache that becomes an O(events × parse) blowup).
+    asts: RefCell<HashMap<PathBuf, Arc<AST>>>,
+}
+
+impl RhaiExecutor {
+    /// Build a deterministic engine. Time, random, IO, debug/print are all
+    /// excluded by construction (we register packages by name, not the
+    /// StandardPackage bundle which would pull in BasicTimePackage).
+    pub fn new_sandboxed() -> Self {
+        let mut engine = Engine::new_raw();
+        // Deliberately omitted: BasicTimePackage, EvalPackage, DebugPackage.
+        CorePackage::new().register_into_engine(&mut engine);
+        LogicPackage::new().register_into_engine(&mut engine);
+        ArithmeticPackage::new().register_into_engine(&mut engine);
+        BasicArrayPackage::new().register_into_engine(&mut engine);
+        BasicMapPackage::new().register_into_engine(&mut engine);
+        BasicStringPackage::new().register_into_engine(&mut engine);
+        BasicIteratorPackage::new().register_into_engine(&mut engine);
+
+        engine.set_max_call_levels(64);
+        engine.set_max_expr_depths(64, 32);
+        Self {
+            engine,
+            asts: RefCell::new(HashMap::new()),
+        }
+    }
+
+    pub fn run(&self, script_path: &Path, input: Value) -> Result<Vec<FieldOp>, RhaiError> {
+        let ast = self.ast_for(script_path)?;
+
+        let dyn_input: Dynamic = rhai::serde::to_dynamic(input)
+            .map_err(|e| RhaiError::Runtime(format!("input -> dynamic: {}", e)))?;
+        let mut scope = Scope::new();
+        scope.push_dynamic("input", dyn_input);
+
+        let result: Dynamic = self
+            .engine
+            .eval_ast_with_scope(&mut scope, &ast)
+            .map_err(|e| RhaiError::Runtime(e.to_string()))?;
+
+        let arr = result.into_array().map_err(|_| RhaiError::BadDelta)?;
+
+        let mut ops = Vec::with_capacity(arr.len());
+        for item in arr {
+            let json: Value = rhai::serde::from_dynamic(&item)
+                .map_err(|e| RhaiError::BadOp(format!("dynamic -> json: {}", e)))?;
+            let op: FieldOp = serde_json::from_value(json)
+                .map_err(|e| RhaiError::BadOp(e.to_string()))?;
+            ops.push(op);
+        }
+        Ok(ops)
+    }
+
+    /// Returns a cached compiled AST for `script_path`, compiling it on the
+    /// first call. Cache hits avoid filesystem IO and parse cost entirely.
+    fn ast_for(&self, script_path: &Path) -> Result<Arc<AST>, RhaiError> {
+        if let Some(ast) = self.asts.borrow().get(script_path) {
+            return Ok(Arc::clone(ast));
+        }
+        let source = std::fs::read_to_string(script_path)?;
+        let compiled = self
+            .engine
+            .compile(&source)
+            .map_err(|e| RhaiError::Compile(e.to_string()))?;
+        let arc = Arc::new(compiled);
+        self.asts
+            .borrow_mut()
+            .insert(script_path.to_path_buf(), Arc::clone(&arc));
+        Ok(arc)
+    }
+}
diff --git a/crates/modules/nakui/core/src/run.rs b/crates/modules/nakui/core/src/run.rs
new file mode 100644
index 0000000..672b309
--- /dev/null
+++ b/crates/modules/nakui/core/src/run.rs
@@ -0,0 +1,352 @@
+//! `nakui run` server: a long-lived process that holds an in-memory store
+//! reconstructed from the log, exposes a Unix Domain Socket, and serves
+//! line-delimited JSON requests to drive the kernel.
+//!
+//! Why UDS + line-JSON for V1:
+//!   - Multi-client without committing to a transport (HTTP/NATS later).
+//!   - Filesystem permissions gate access; no port exposure.
+//!   - Self-describing: `describe` returns the manifest's morphism specs
+//!     so an agent (human or LLM) can drive the server without external
+//!     docs.
+//!
+//! Concurrency: one connection at a time. Backed by `&mut Store`, the
+//! kernel is single-writer by design. Multiple clients queue in
+//! `accept()`. If/when we want concurrency, the right unit to parallelize
+//! is reads, not writes — that's a future refactor with locks at the
+//! right granularity.
+//!
+//! Recovery: every `execute` goes through `execute_and_log_with_recovery`
+//! so a transient apply failure auto-rebuilds the in-memory store from
+//! the log without taking the server down.
+
+use std::io::{BufRead, BufReader, Write};
+use std::os::unix::net::{UnixListener, UnixStream};
+use std::path::Path;
+
+use serde::Deserialize;
+use serde_json::{Value, json};
+use thiserror::Error;
+use uuid::Uuid;
+
+use crate::event_log::{
+    EventLog, RecoverableExecuteError, ReplayError, Snapshot, SnapshotMismatchError,
+    execute_and_log_with_recovery, replay_with_snapshot_into, verify_log,
+};
+use crate::executor::Executor;
+use crate::store::Store;
+
+#[derive(Debug, Error)]
+pub enum RunError {
+    #[error("io: {0}")]
+    Io(#[from] std::io::Error),
+    #[error("clear store on startup: {0}")]
+    Clear(#[source] crate::store::StoreError),
+    #[error("replay on startup: {0}")]
+    Replay(#[from] ReplayError),
+    #[error("log: {0}")]
+    Log(#[from] crate::event_log::LogError),
+    #[error("snapshot incompatible: {0}")]
+    SnapshotMismatch(#[from] SnapshotMismatchError),
+    #[error(
+        "snapshot/log gap: snapshot covers up to seq {snap_seq}, log's first remaining entry is seq {log_first_seq} (expected ≤ {expected})"
+    )]
+    SnapshotGap {
+        snap_seq: u64,
+        log_first_seq: u64,
+        expected: u64,
+    },
+}
+
+/// Run the server until a `shutdown` request is received or `accept`
+/// returns an unrecoverable error. On exit, removes the socket file.
+///
+/// Startup reconstruction:
+///   - With `Some(snapshot)`: validate its `schema_hash` against the
+///     executor, seed the store from the snapshot, replay only the log
+///     tail (entries with `seq > snapshot.seq`).
+///   - With `None`: full replay from seq 0. Slower for long logs.
+///
+/// In both cases the store is wiped first, so the server never serves
+/// requests against a state the log can't reproduce. This is true for
+/// `MemoryStore` and for persistent backends like `SurrealStore` —
+/// persistence is a durability property of the runtime cache, not a
+/// way to skip replay. (A future "skip replay if last_applied_seq
+/// matches" optimization would change that.)
+pub fn run_server<S: Store>(
+    executor: Executor,
+    mut log: EventLog,
+    mut store: S,
+    snapshot: Option<Snapshot>,
+    socket_path: &Path,
+) -> Result<(), RunError> {
+    startup_replay(&executor, &log, &mut store, snapshot.as_ref())?;
+
+    // Best-effort cleanup of stale sockets from a prior crashed run.
+    // Bind itself will fail if a live process is already listening.
+    let _ = std::fs::remove_file(socket_path);
+    let listener = UnixListener::bind(socket_path)?;
+
+    let result = accept_loop(&listener, &executor, &mut store, &mut log);
+    let _ = std::fs::remove_file(socket_path);
+    result
+}
+
+fn startup_replay<S: Store>(
+    executor: &Executor,
+    log: &EventLog,
+    store: &mut S,
+    snapshot: Option<&Snapshot>,
+) -> Result<(), RunError> {
+    // Snapshot validation runs first (cheap) so a bad snapshot is caught
+    // even when we'd otherwise take the skip-replay fast path.
+    if let Some(snap) = snapshot {
+        snap.ensure_compatible_with(executor)?;
+        let entries = log.entries()?;
+        if let Some(first) = entries.first() {
+            let expected = snap.seq.saturating_add(1);
+            if first.seq() > expected {
+                return Err(RunError::SnapshotGap {
+                    snap_seq: snap.seq,
+                    log_first_seq: first.seq(),
+                    expected,
+                });
+            }
+        }
+    }
+
+    // Fast path: persistent stores carry a `last_applied_seq` marker;
+    // when it matches the log's last seq, the store is verifiably in
+    // sync and we can skip the clear+replay entirely. Failures here
+    // (e.g. backend can't read meta) just fall through to full replay
+    // — never a correctness issue.
+    let log_last_seq = log.entries()?.last().map(|e| e.seq());
+    if let Ok(applied) = store.last_applied_seq() {
+        if applied == log_last_seq && applied.is_some() {
+            return Ok(());
+        }
+    }
+
+    store.clear().map_err(RunError::Clear)?;
+    replay_with_snapshot_into(log, snapshot, store)?;
+    Ok(())
+}
+
+fn accept_loop<S: Store>(
+    listener: &UnixListener,
+    executor: &Executor,
+    store: &mut S,
+    log: &mut EventLog,
+) -> Result<(), RunError> {
+    loop {
+        let (stream, _addr) = listener.accept()?;
+        let shutdown = handle_connection(stream, executor, store, log);
+        if shutdown {
+            return Ok(());
+        }
+    }
+}
+
+#[derive(Debug, Deserialize)]
+#[serde(tag = "op", rename_all = "snake_case")]
+enum Request {
+    Execute {
+        morphism: String,
+        #[serde(default)]
+        inputs: std::collections::BTreeMap<String, Uuid>,
+        #[serde(default)]
+        params: Value,
+    },
+    Load {
+        entity: String,
+        id: Uuid,
+    },
+    Describe,
+    Verify,
+    /// Return the SHA-256 of the live store's full state plus a record
+    /// count. Used by the drift detector as the cheap fast-path check
+    /// before asking for the full record dump.
+    HashState,
+    /// Return every record on the server in canonical order. Used after
+    /// a hash mismatch to compute the per-record diff. Response can be
+    /// large — the operator opts into it.
+    DumpRecords,
+    Shutdown,
+}
+
+/// Process one connection. Returns `true` if the client requested
+/// shutdown — the caller should stop the accept loop after the response
+/// has been flushed.
+///
+/// IO errors on a single connection don't kill the server: we log to
+/// stderr and move on. Only a request-level shutdown ends the loop.
+fn handle_connection<S: Store>(
+    stream: UnixStream,
+    executor: &Executor,
+    store: &mut S,
+    log: &mut EventLog,
+) -> bool {
+    let mut writer = match stream.try_clone() {
+        Ok(s) => s,
+        Err(e) => {
+            eprintln!("nakui run: clone stream: {}", e);
+            return false;
+        }
+    };
+    let reader = BufReader::new(stream);
+    for line in reader.lines() {
+        let line = match line {
+            Ok(l) => l,
+            Err(e) => {
+                eprintln!("nakui run: read: {}", e);
+                return false;
+            }
+        };
+        if line.trim().is_empty() {
+            continue;
+        }
+        let (response, shutdown) = dispatch(&line, executor, store, log);
+        let bytes = serde_json::to_vec(&response).expect("response serializes");
+        if let Err(e) = writer.write_all(&bytes).and_then(|_| writer.write_all(b"\n")) {
+            eprintln!("nakui run: write: {}", e);
+            return false;
+        }
+        if shutdown {
+            let _ = writer.flush();
+            return true;
+        }
+    }
+    false
+}
+
+fn dispatch<S: Store>(
+    line: &str,
+    executor: &Executor,
+    store: &mut S,
+    log: &mut EventLog,
+) -> (Value, bool) {
+    let req: Request = match serde_json::from_str(line) {
+        Ok(r) => r,
+        Err(e) => return (error_response(&format!("bad request: {}", e)), false),
+    };
+    match req {
+        Request::Execute {
+            morphism,
+            inputs,
+            params,
+        } => {
+            let inputs_vec: Vec<(&str, Uuid)> =
+                inputs.iter().map(|(k, v)| (k.as_str(), *v)).collect();
+            match execute_and_log_with_recovery(
+                executor,
+                store,
+                log,
+                &morphism,
+                &inputs_vec,
+                params,
+            ) {
+                Ok(ops) => (
+                    json!({
+                        "ok": true,
+                        "seq": log.next_seq().saturating_sub(1),
+                        "ops": ops,
+                        "schema_hash": executor.schema_hash(&morphism).map(|h| hex_encode(&h)),
+                    }),
+                    false,
+                ),
+                Err(RecoverableExecuteError::PreLog(e)) => (
+                    json!({"ok": false, "stage": "pre_log", "error": e.to_string()}),
+                    false,
+                ),
+                Err(RecoverableExecuteError::LogAppend(e)) => (
+                    json!({"ok": false, "stage": "log_append", "error": e.to_string()}),
+                    false,
+                ),
+                Err(e @ RecoverableExecuteError::Unrecoverable { .. }) => (
+                    json!({"ok": false, "stage": "unrecoverable", "error": e.to_string()}),
+                    false,
+                ),
+            }
+        }
+        Request::Load { entity, id } => {
+            let value = store.load(&entity, id);
+            (json!({"ok": true, "value": value}), false)
+        }
+        Request::Describe => {
+            let hashes: std::collections::BTreeMap<String, String> = executor
+                .schema_hashes
+                .iter()
+                .map(|(k, v)| (k.clone(), hex_encode(v)))
+                .collect();
+            (
+                json!({
+                    "ok": true,
+                    "protocol": 1,
+                    "module": executor.manifest.module,
+                    "schemas": executor.manifest.effective_schemas(),
+                    "morphisms": executor.manifest.morphisms,
+                    "schema_hashes": hashes,
+                }),
+                false,
+            )
+        }
+        Request::Verify => match verify_log(log, executor) {
+            Ok(()) => {
+                let entries = log
+                    .entries()
+                    .map(|es| es.len())
+                    .unwrap_or(0);
+                (json!({"ok": true, "entries": entries}), false)
+            }
+            Err(e) => (
+                json!({"ok": false, "error": e.to_string()}),
+                false,
+            ),
+        },
+        Request::HashState => {
+            let records: Vec<_> = match store.iter() {
+                Ok(it) => it.collect(),
+                Err(e) => return (json!({"ok": false, "error": e.to_string()}), false),
+            };
+            let count = records.len();
+            let hash = match store.hash_state() {
+                Ok(h) => h,
+                Err(e) => return (json!({"ok": false, "error": e.to_string()}), false),
+            };
+            (
+                json!({
+                    "ok": true,
+                    "hash": hex_encode(&hash),
+                    "records": count,
+                }),
+                false,
+            )
+        }
+        Request::DumpRecords => match store.iter() {
+            Ok(it) => {
+                let records: Vec<Value> = it
+                    .map(|(entity, id, value)| {
+                        json!({"entity": entity, "id": id, "value": value})
+                    })
+                    .collect();
+                (json!({"ok": true, "records": records}), false)
+            }
+            Err(e) => (json!({"ok": false, "error": e.to_string()}), false),
+        },
+        Request::Shutdown => (json!({"ok": true, "shutdown": true}), true),
+    }
+}
+
+fn error_response(msg: &str) -> Value {
+    json!({"ok": false, "error": msg})
+}
+
+fn hex_encode(bytes: &[u8]) -> String {
+    const HEX: &[u8; 16] = b"0123456789abcdef";
+    let mut out = String::with_capacity(bytes.len() * 2);
+    for &b in bytes {
+        out.push(HEX[(b >> 4) as usize] as char);
+        out.push(HEX[(b & 0x0f) as usize] as char);
+    }
+    out
+}
+
diff --git a/crates/modules/nakui/core/src/store.rs b/crates/modules/nakui/core/src/store.rs
new file mode 100644
index 0000000..ef10b68
--- /dev/null
+++ b/crates/modules/nakui/core/src/store.rs
@@ -0,0 +1,593 @@
+use serde_json::Value;
+use sha2::{Digest, Sha256};
+use std::collections::HashMap;
+use thiserror::Error;
+use uuid::Uuid;
+
+use crate::delta::FieldOp;
+
+#[derive(Debug, Clone, Error)]
+pub enum StoreError {
+    #[error("entity {0} id {1} not found")]
+    NotFound(String, Uuid),
+    #[error("entity {0} id {1} already exists")]
+    Conflict(String, Uuid),
+    #[error("set on non-object record at {0} {1}")]
+    NotAnObject(String, Uuid),
+    /// Backend-specific transient or systemic failure (network, disk,
+    /// driver). Distinct from the data-shape errors above.
+    #[error("backend error: {0}")]
+    Backend(String),
+}
+
+pub trait Store {
+    fn load(&self, entity: &str, id: Uuid) -> Option<Value>;
+
+    /// Insert or replace a record without going through the morphism
+    /// pipeline. Represents external/boundary input — the source of
+    /// records that didn't originate from a kernel-validated event.
+    fn seed(&mut self, entity: &str, id: Uuid, data: Value);
+
+    /// Read-only check: would `apply(ops)` succeed against current state?
+    /// Does NOT mutate. The kernel runs this as the last step of `compute`
+    /// so that, by the time we log an event, the apply is contractually
+    /// guaranteed to land.
+    fn apply_dry_run(&self, ops: &[FieldOp]) -> Result<(), StoreError>;
+
+    fn apply(&mut self, ops: &[FieldOp]) -> Result<(), StoreError>;
+
+    /// Drop every record. Used by `reconcile` to wipe a stale store before
+    /// replaying the log. Must leave the store in the same state it would
+    /// be in immediately after construction. Implementors that override
+    /// `last_applied_seq` must reset that marker here too — a cleared
+    /// store has applied nothing.
+    fn clear(&mut self) -> Result<(), StoreError>;
+
+    /// The last log seq whose effects are reflected in this store, if
+    /// the store can persist that fact. Default `Ok(None)` covers
+    /// transient backends. The startup path uses this to skip the full
+    /// replay when the store is verifiably already in sync with the log.
+    fn last_applied_seq(&self) -> Result<Option<u64>, StoreError> {
+        Ok(None)
+    }
+
+    /// Persist the marker after a successful apply / seed / replay.
+    /// Best-effort: callers ignore failures here because a stale marker
+    /// only costs an extra full replay on next startup, never
+    /// correctness — full replay starts with `clear()`, so it tolerates
+    /// any prior state. Default impl is a no-op for transient backends.
+    fn set_last_applied_seq(&mut self, _seq: u64) -> Result<(), StoreError> {
+        Ok(())
+    }
+
+    /// Enumerate every record in canonical order: sorted first by entity
+    /// name, then by id bytes. The canonical order is what makes
+    /// `hash_state` reproducible — without it two stores with the same
+    /// records would hash differently depending on insertion order.
+    ///
+    /// Returns owned `Value`s. For an in-memory backend this clones; for
+    /// a remote backend it materializes a snapshot. V1 chooses simplicity
+    /// over streaming — the hash and drift-comparison use cases need to
+    /// see all records anyway, and an iterator over a Vec keeps the
+    /// trait method object-safe and free of async lifetime concerns.
+    fn iter(&self) -> Result<Box<dyn Iterator<Item = (String, Uuid, Value)> + '_>, StoreError>;
+
+    /// Deterministic SHA-256 of the store's full state. Two stores with
+    /// the same records (regardless of how they got there or which
+    /// backend they live in) produce the same hash; any drift produces
+    /// a different one. The default impl is the contract — backends
+    /// should only override it for backend-native acceleration (e.g.
+    /// server-side table digests), and an override must produce the
+    /// same bytes as the default.
+    ///
+    /// Framing per record:
+    ///   entity_bytes | 0x00 | id_bytes | 0x00 | canonical_value_hash
+    /// The length prefix on entity/id prevents (entity="ab", id="c")
+    /// from colliding with (entity="a", id="bc"). The value bytes are
+    /// produced by `hash_value`, which walks the JSON tree with
+    /// type-tagged framing — that decouples the hash from
+    /// `serde_json::to_vec`'s representation choices (especially
+    /// integer-valued floats vs ints) so cross-backend comparison
+    /// works.
+    fn hash_state(&self) -> Result<[u8; 32], StoreError> {
+        let mut hasher = Sha256::new();
+        for (entity, id, value) in self.iter()? {
+            hasher.update(entity.as_bytes());
+            hasher.update([0u8]);
+            hasher.update(id.as_bytes());
+            hasher.update([0u8]);
+            hash_value(&mut hasher, &value);
+        }
+        Ok(hasher.finalize().into())
+    }
+}
+
+/// Canonical hash of a `serde_json::Value`. Type-tagged so a string
+/// "true" can't collide with the boolean `true`; length-prefixed so
+/// concatenation can't shift bytes between fields. Numbers normalize:
+/// any integer-valued number (i64, u64, or a finite f64 with no
+/// fractional part) is hashed as an i128 — that's what makes
+/// cross-backend equality work, since SurrealDB may round-trip
+/// what the caller wrote as `100_i64` back as the same numeric value
+/// without us needing to commit to a wire-format-specific
+/// representation.
+pub fn hash_value(hasher: &mut Sha256, v: &Value) {
+    match v {
+        Value::Null => hasher.update([TAG_NULL]),
+        Value::Bool(b) => {
+            hasher.update([TAG_BOOL]);
+            hasher.update([*b as u8]);
+        }
+        Value::Number(n) => {
+            if let Some(i) = n.as_i64() {
+                hash_int(hasher, i as i128);
+            } else if let Some(u) = n.as_u64() {
+                hash_int(hasher, u as i128);
+            } else if let Some(f) = n.as_f64() {
+                // Integer-valued floats canonicalize to int. Anything
+                // else (fractions, NaN, infinities) hashes as the raw
+                // f64 bit pattern — that's still deterministic, just
+                // not normalized.
+                if f.is_finite()
+                    && f.fract() == 0.0
+                    && f >= I128_MIN_AS_F64
+                    && f <= I128_MAX_AS_F64
+                {
+                    hash_int(hasher, f as i128);
+                } else {
+                    hasher.update([TAG_FLOAT]);
+                    hasher.update(f.to_bits().to_le_bytes());
+                }
+            } else {
+                // serde_json::Number guarantees one of the above; this
+                // branch only fires if a future variant appears.
+                hasher.update([TAG_FLOAT]);
+                hasher.update(f64::NAN.to_bits().to_le_bytes());
+            }
+        }
+        Value::String(s) => {
+            hasher.update([TAG_STRING]);
+            hasher.update((s.len() as u64).to_le_bytes());
+            hasher.update(s.as_bytes());
+        }
+        Value::Array(arr) => {
+            hasher.update([TAG_ARRAY]);
+            hasher.update((arr.len() as u64).to_le_bytes());
+            for item in arr {
+                hash_value(hasher, item);
+            }
+        }
+        Value::Object(map) => {
+            hasher.update([TAG_OBJECT]);
+            hasher.update((map.len() as u64).to_le_bytes());
+            // serde_json::Map without `preserve_order` is BTreeMap
+            // (alphabetical). We sort defensively in case the build
+            // pulls in `preserve_order` transitively from a future dep.
+            let mut keys: Vec<&String> = map.keys().collect();
+            keys.sort();
+            for k in keys {
+                hasher.update((k.len() as u64).to_le_bytes());
+                hasher.update(k.as_bytes());
+                hash_value(hasher, &map[k]);
+            }
+        }
+    }
+}
+
+fn hash_int(hasher: &mut Sha256, n: i128) {
+    hasher.update([TAG_INT]);
+    hasher.update(n.to_le_bytes());
+}
+
+const TAG_NULL: u8 = 0;
+const TAG_BOOL: u8 = 1;
+const TAG_INT: u8 = 2;
+const TAG_FLOAT: u8 = 3;
+const TAG_STRING: u8 = 4;
+const TAG_ARRAY: u8 = 5;
+const TAG_OBJECT: u8 = 6;
+
+// f64 can't represent i128::MAX exactly; the cast truncates upward to
+// the next representable f64. Use those as the comparison bounds so
+// `f as i128` stays well-defined.
+const I128_MIN_AS_F64: f64 = -1.7014118346046923e38;
+const I128_MAX_AS_F64: f64 = 1.7014118346046923e38;
+
+#[derive(Debug, Default, Clone, PartialEq)]
+pub struct MemoryStore {
+    records: HashMap<String, HashMap<Uuid, Value>>,
+    /// Last log seq whose effects are reflected here. In-process only —
+    /// resets to `None` on construction or `clear`. The skip-replay
+    /// optimization in `nakui run` benefits the persistent backends;
+    /// for `MemoryStore` it's harmless bookkeeping (process restart =
+    /// new store = `None`, which forces full replay).
+    last_applied: Option<u64>,
+}
+
+impl MemoryStore {
+    pub fn new() -> Self {
+        Self::default()
+    }
+
+    /// Borrow the internal records map. Used by `Snapshot::from_memory_store`
+    /// to capture state for snapshot persistence.
+    pub fn records(&self) -> &HashMap<String, HashMap<Uuid, Value>> {
+        &self.records
+    }
+}
+
+impl Store for MemoryStore {
+    fn load(&self, entity: &str, id: Uuid) -> Option<Value> {
+        self.records.get(entity)?.get(&id).cloned()
+    }
+
+    fn seed(&mut self, entity: &str, id: Uuid, data: Value) {
+        self.records
+            .entry(entity.to_string())
+            .or_default()
+            .insert(id, data);
+    }
+
+    fn apply_dry_run(&self, ops: &[FieldOp]) -> Result<(), StoreError> {
+        for op in ops {
+            match op {
+                FieldOp::Set { path, .. } => {
+                    match self.records.get(&path.entity).and_then(|m| m.get(&path.id)) {
+                        None => {
+                            return Err(StoreError::NotFound(path.entity.clone(), path.id));
+                        }
+                        Some(Value::Object(_)) => {}
+                        Some(_) => {
+                            return Err(StoreError::NotAnObject(path.entity.clone(), path.id));
+                        }
+                    }
+                }
+                FieldOp::Create { entity, id, .. } => {
+                    if self
+                        .records
+                        .get(entity)
+                        .and_then(|m| m.get(id))
+                        .is_some()
+                    {
+                        return Err(StoreError::Conflict(entity.clone(), *id));
+                    }
+                }
+                FieldOp::Delete { entity, id } => {
+                    if self
+                        .records
+                        .get(entity)
+                        .and_then(|m| m.get(id))
+                        .is_none()
+                    {
+                        return Err(StoreError::NotFound(entity.clone(), *id));
+                    }
+                }
+            }
+        }
+        Ok(())
+    }
+
+    fn apply(&mut self, ops: &[FieldOp]) -> Result<(), StoreError> {
+        self.apply_dry_run(ops)?;
+        for op in ops {
+            match op {
+                FieldOp::Set { path, value } => {
+                    let rec = self
+                        .records
+                        .get_mut(&path.entity)
+                        .and_then(|m| m.get_mut(&path.id))
+                        .expect("validated by dry_run");
+                    let map = match rec {
+                        Value::Object(m) => m,
+                        _ => unreachable!("dry_run guards against non-object"),
+                    };
+                    map.insert(path.field.clone(), value.clone());
+                }
+                FieldOp::Create { entity, id, data } => {
+                    self.records
+                        .entry(entity.clone())
+                        .or_default()
+                        .insert(*id, data.clone());
+                }
+                FieldOp::Delete { entity, id } => {
+                    self.records
+                        .get_mut(entity)
+                        .expect("validated by dry_run")
+                        .remove(id);
+                }
+            }
+        }
+        Ok(())
+    }
+
+    fn clear(&mut self) -> Result<(), StoreError> {
+        self.records.clear();
+        self.last_applied = None;
+        Ok(())
+    }
+
+    fn last_applied_seq(&self) -> Result<Option<u64>, StoreError> {
+        Ok(self.last_applied)
+    }
+
+    fn set_last_applied_seq(&mut self, seq: u64) -> Result<(), StoreError> {
+        self.last_applied = Some(seq);
+        Ok(())
+    }
+
+    fn iter(&self) -> Result<Box<dyn Iterator<Item = (String, Uuid, Value)> + '_>, StoreError> {
+        let mut out: Vec<(String, Uuid, Value)> = self
+            .records
+            .iter()
+            .flat_map(|(entity, m)| {
+                m.iter()
+                    .map(move |(id, v)| (entity.clone(), *id, v.clone()))
+            })
+            .collect();
+        out.sort_by(|a, b| a.0.cmp(&b.0).then_with(|| a.1.as_bytes().cmp(b.1.as_bytes())));
+        Ok(Box::new(out.into_iter()))
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::delta::{FieldOp, FieldPath};
+    use serde_json::json;
+
+    #[test]
+    fn dry_run_rejects_set_on_non_object() {
+        let mut store = MemoryStore::new();
+        let id = Uuid::new_v4();
+        store.seed("Caja", id, json!(42)); // not an object
+        let op = FieldOp::Set {
+            path: FieldPath {
+                entity: "Caja".into(),
+                id,
+                field: "saldo".into(),
+            },
+            value: json!(100),
+        };
+        match store.apply_dry_run(&[op.clone()]) {
+            Err(StoreError::NotAnObject(e, i)) => {
+                assert_eq!(e, "Caja");
+                assert_eq!(i, id);
+            }
+            other => panic!("expected NotAnObject, got {:?}", other),
+        }
+        // apply must reject too without panicking.
+        assert!(matches!(
+            store.apply(&[op]),
+            Err(StoreError::NotAnObject(_, _))
+        ));
+    }
+
+    #[test]
+    fn dry_run_rejects_create_conflict() {
+        let mut store = MemoryStore::new();
+        let id = Uuid::new_v4();
+        store.seed("Caja", id, json!({"id": id.to_string()}));
+        let op = FieldOp::Create {
+            entity: "Caja".into(),
+            id,
+            data: json!({"id": id.to_string()}),
+        };
+        assert!(matches!(
+            store.apply_dry_run(&[op]),
+            Err(StoreError::Conflict(_, _))
+        ));
+    }
+
+    #[test]
+    fn dry_run_passes_for_valid_set() {
+        let mut store = MemoryStore::new();
+        let id = Uuid::new_v4();
+        store.seed("Caja", id, json!({"saldo": 100, "currency": "USD"}));
+        let op = FieldOp::Set {
+            path: FieldPath {
+                entity: "Caja".into(),
+                id,
+                field: "saldo".into(),
+            },
+            value: json!(150),
+        };
+        assert!(store.apply_dry_run(&[op]).is_ok());
+    }
+
+    #[test]
+    fn iter_returns_canonical_order_regardless_of_insertion() {
+        let a = Uuid::new_v4();
+        let b = Uuid::new_v4();
+        let c = Uuid::new_v4();
+
+        let mut s1 = MemoryStore::new();
+        s1.seed("Caja", a, json!({"id": a.to_string(), "x": 1}));
+        s1.seed("Movimiento", c, json!({"id": c.to_string(), "y": 3}));
+        s1.seed("Caja", b, json!({"id": b.to_string(), "x": 2}));
+
+        let mut s2 = MemoryStore::new();
+        s2.seed("Movimiento", c, json!({"id": c.to_string(), "y": 3}));
+        s2.seed("Caja", b, json!({"id": b.to_string(), "x": 2}));
+        s2.seed("Caja", a, json!({"id": a.to_string(), "x": 1}));
+
+        let r1: Vec<_> = s1.iter().unwrap().collect();
+        let r2: Vec<_> = s2.iter().unwrap().collect();
+        assert_eq!(r1, r2, "iter order must be insertion-independent");
+
+        // Entities lexicographically sorted (Caja before Movimiento).
+        let entities: Vec<&str> = r1.iter().map(|(e, _, _)| e.as_str()).collect();
+        assert_eq!(entities, vec!["Caja", "Caja", "Movimiento"]);
+
+        // Within Caja, ids in byte order.
+        let caja_ids: Vec<Uuid> = r1
+            .iter()
+            .filter(|(e, _, _)| e == "Caja")
+            .map(|(_, id, _)| *id)
+            .collect();
+        let mut expected = vec![a, b];
+        expected.sort_by(|x, y| x.as_bytes().cmp(y.as_bytes()));
+        assert_eq!(caja_ids, expected);
+    }
+
+    #[test]
+    fn hash_state_is_deterministic_and_independent_of_insertion_order() {
+        let a = Uuid::new_v4();
+        let b = Uuid::new_v4();
+
+        let mut s1 = MemoryStore::new();
+        s1.seed("Caja", a, json!({"id": a.to_string(), "saldo": 100}));
+        s1.seed("Caja", b, json!({"id": b.to_string(), "saldo": 200}));
+
+        let mut s2 = MemoryStore::new();
+        s2.seed("Caja", b, json!({"id": b.to_string(), "saldo": 200}));
+        s2.seed("Caja", a, json!({"id": a.to_string(), "saldo": 100}));
+
+        assert_eq!(
+            s1.hash_state().unwrap(),
+            s2.hash_state().unwrap(),
+            "equal state must hash identically regardless of how it was built"
+        );
+    }
+
+    #[test]
+    fn hash_state_changes_when_state_changes() {
+        let a = Uuid::new_v4();
+
+        let mut s1 = MemoryStore::new();
+        s1.seed("Caja", a, json!({"id": a.to_string(), "saldo": 100}));
+
+        let mut s2 = MemoryStore::new();
+        s2.seed("Caja", a, json!({"id": a.to_string(), "saldo": 101}));
+
+        assert_ne!(
+            s1.hash_state().unwrap(),
+            s2.hash_state().unwrap(),
+            "off-by-one in a single field must produce a different hash"
+        );
+
+        // Adding a record changes the hash too.
+        let mut s3 = MemoryStore::new();
+        s3.seed("Caja", a, json!({"id": a.to_string(), "saldo": 100}));
+        s3.seed("Caja", Uuid::new_v4(), json!({"id": "extra", "saldo": 0}));
+        assert_ne!(s1.hash_state().unwrap(), s3.hash_state().unwrap());
+    }
+
+    #[test]
+    fn last_applied_seq_round_trips_and_resets_on_clear() {
+        let mut store = MemoryStore::new();
+        assert_eq!(
+            store.last_applied_seq().unwrap(),
+            None,
+            "fresh MemoryStore has no marker"
+        );
+        store.set_last_applied_seq(5).unwrap();
+        assert_eq!(store.last_applied_seq().unwrap(), Some(5));
+        store.set_last_applied_seq(12).unwrap();
+        assert_eq!(store.last_applied_seq().unwrap(), Some(12));
+        store.clear().unwrap();
+        assert_eq!(
+            store.last_applied_seq().unwrap(),
+            None,
+            "clear() resets the marker — a cleared store has applied nothing"
+        );
+    }
+
+    #[test]
+    fn integer_and_integer_valued_float_hash_identically() {
+        // The cross-backend property: the same numeric value, written
+        // by a backend as i64 vs read back as integer-valued f64,
+        // must hash the same.
+        let int_value = json!({"saldo": 100_i64});
+        let float_value = json!({"saldo": 100.0_f64});
+
+        let mut h_int = sha2::Sha256::new();
+        super::hash_value(&mut h_int, &int_value);
+        let mut h_float = sha2::Sha256::new();
+        super::hash_value(&mut h_float, &float_value);
+        assert_eq!(
+            h_int.finalize(),
+            h_float.finalize(),
+            "integer-valued numbers must canonicalize regardless of source representation"
+        );
+    }
+
+    #[test]
+    fn fractional_floats_do_not_canonicalize_to_int() {
+        // Floats with fractional parts must remain floats — collapsing
+        // 100.5 into 100 would hide real differences.
+        let int_value = json!({"x": 100_i64});
+        let frac_value = json!({"x": 100.5_f64});
+
+        let mut h_int = sha2::Sha256::new();
+        super::hash_value(&mut h_int, &int_value);
+        let mut h_frac = sha2::Sha256::new();
+        super::hash_value(&mut h_frac, &frac_value);
+        assert_ne!(
+            h_int.finalize(),
+            h_frac.finalize(),
+            "100 and 100.5 must hash differently"
+        );
+    }
+
+    #[test]
+    fn same_object_with_different_insertion_order_hashes_same() {
+        // serde_json::Map is BTreeMap by default but we sort defensively
+        // in case `preserve_order` is enabled by some transitive dep.
+        let mut m1 = serde_json::Map::new();
+        m1.insert("a".into(), json!(1));
+        m1.insert("b".into(), json!(2));
+        m1.insert("c".into(), json!(3));
+        let mut m2 = serde_json::Map::new();
+        m2.insert("c".into(), json!(3));
+        m2.insert("a".into(), json!(1));
+        m2.insert("b".into(), json!(2));
+
+        let mut h1 = sha2::Sha256::new();
+        super::hash_value(&mut h1, &Value::Object(m1));
+        let mut h2 = sha2::Sha256::new();
+        super::hash_value(&mut h2, &Value::Object(m2));
+        assert_eq!(h1.finalize(), h2.finalize());
+    }
+
+    #[test]
+    fn type_tagged_framing_distinguishes_string_from_number() {
+        // The string "42" must not collide with the number 42.
+        let str_v = json!("42");
+        let num_v = json!(42);
+        let mut h_str = sha2::Sha256::new();
+        super::hash_value(&mut h_str, &str_v);
+        let mut h_num = sha2::Sha256::new();
+        super::hash_value(&mut h_num, &num_v);
+        assert_ne!(h_str.finalize(), h_num.finalize());
+
+        // Bool true must not collide with the number 1.
+        let bool_v = json!(true);
+        let one_v = json!(1);
+        let mut h_bool = sha2::Sha256::new();
+        super::hash_value(&mut h_bool, &bool_v);
+        let mut h_one = sha2::Sha256::new();
+        super::hash_value(&mut h_one, &one_v);
+        assert_ne!(h_bool.finalize(), h_one.finalize());
+    }
+
+    #[test]
+    fn empty_store_has_a_well_defined_hash() {
+        let s1 = MemoryStore::new();
+        let s2 = MemoryStore::new();
+        assert_eq!(s1.hash_state().unwrap(), s2.hash_state().unwrap());
+        // The empty hash is the SHA-256 of an empty input — fix the
+        // expected bytes so an accidental framing change in `hash_state`
+        // can't silently sail through.
+        let expected = hex_decode(
+            "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
+        );
+        assert_eq!(s1.hash_state().unwrap().to_vec(), expected);
+    }
+
+    fn hex_decode(s: &str) -> Vec<u8> {
+        (0..s.len())
+            .step_by(2)
+            .map(|i| u8::from_str_radix(&s[i..i + 2], 16).expect("hex"))
+            .collect()
+    }
+}
diff --git a/crates/modules/nakui/core/src/surreal_store.rs b/crates/modules/nakui/core/src/surreal_store.rs
new file mode 100644
index 0000000..c233e6e
--- /dev/null
+++ b/crates/modules/nakui/core/src/surreal_store.rs
@@ -0,0 +1,403 @@
+//! SurrealDB-backed `Store` implementation.
+//!
+//! Wraps an embedded `kv-mem` SurrealDB instance behind the same sync
+//! `Store` trait the kernel uses. Each instance owns a private `tokio`
+//! current-thread runtime and `block_on`s every async call.
+//!
+//! Why everything goes through `db.query()`:
+//! SurrealDB 2.x's typed-response API (`db.upsert(thing).content(data)`)
+//! deserializes responses through a serializer that is hostile to
+//! `serde_json::Value` and to dynamic record shapes. Using raw SurrealQL
+//! with parameter binding sidesteps that — `Response::check()` validates
+//! success without forcing us to materialize the response into a typed
+//! shape.
+//!
+//! Identity handling: SurrealDB owns record identity via a `RecordId`
+//! (table:id). We strip the application-level `id` field before sending
+//! and restore it on read so KCL schemas (which require `id: str`) see
+//! a stable shape.
+
+use serde_json::Value;
+use surrealdb::Surreal;
+use surrealdb::engine::local::{Db, Mem};
+#[cfg(feature = "persistent")]
+use surrealdb::engine::local::SurrealKv;
+use thiserror::Error;
+use tokio::runtime::Runtime;
+use uuid::Uuid;
+
+use crate::delta::FieldOp;
+use crate::store::{Store, StoreError};
+
+/// Reserved table prefix for runtime metadata that lives alongside user
+/// records. Anything starting with this prefix is hidden from `iter`
+/// (and therefore from `hash_state`, `dump_records`, drift detection)
+/// so user-facing views never see internal bookkeeping.
+const META_TABLE_PREFIX: &str = "nakui_";
+
+/// Single-record table where `last_applied_seq` lives. Singleton id =
+/// `singleton`. Wiped by `clear()` because the table prefix is part of
+/// the enumeration there — a cleared store has applied nothing.
+const META_TABLE: &str = "nakui_runtime_meta";
+const META_SINGLETON_ID: &str = "singleton";
+
+/// Field alias used by `iter` to surface the application-level record
+/// id alongside the rest of the row, in a single per-table query. The
+/// alias is stripped before the row is handed back to the caller, so
+/// it never shows up in user views. Reserved — a user record with a
+/// field of this name would collide and `iter` would error on UUID
+/// parse failure.
+const ITER_ID_ALIAS: &str = "__nakui_app_id";
+
+#[derive(Debug, Error)]
+pub enum SurrealStoreError {
+    #[error("io creating tokio runtime: {0}")]
+    Runtime(#[from] std::io::Error),
+    #[error("surrealdb: {0}")]
+    Backend(#[from] surrealdb::Error),
+}
+
+pub struct SurrealStore {
+    runtime: Runtime,
+    db: Surreal<Db>,
+}
+
+impl SurrealStore {
+    /// Build an in-memory SurrealDB instance (`kv-mem`). Volatile —
+    /// nothing persists when the process exits.
+    pub fn new_in_memory() -> Result<Self, SurrealStoreError> {
+        let runtime = tokio::runtime::Builder::new_current_thread()
+            .enable_all()
+            .build()?;
+        let db = runtime.block_on(async {
+            let db = Surreal::new::<Mem>(()).await?;
+            db.use_ns("nakui").use_db("default").await?;
+            Ok::<_, surrealdb::Error>(db)
+        })?;
+        Ok(Self { runtime, db })
+    }
+
+    /// Build a SurrealKV-backed SurrealDB instance at `path`. Records
+    /// survive process restarts. Requires the `persistent` Cargo feature.
+    ///
+    /// Reopening an existing path resumes from the persisted state — the
+    /// canonical use is `let store = SurrealStore::new_persistent(path)?`
+    /// at process startup, with the path stable across runs.
+    #[cfg(feature = "persistent")]
+    pub fn new_persistent(
+        path: impl AsRef<std::path::Path>,
+    ) -> Result<Self, SurrealStoreError> {
+        let runtime = tokio::runtime::Builder::new_current_thread()
+            .enable_all()
+            .build()?;
+        let path = path.as_ref().to_path_buf();
+        let db = runtime.block_on(async {
+            let db = Surreal::new::<SurrealKv>(path).await?;
+            db.use_ns("nakui").use_db("default").await?;
+            Ok::<_, surrealdb::Error>(db)
+        })?;
+        Ok(Self { runtime, db })
+    }
+}
+
+fn strip_app_id(mut data: Value) -> Value {
+    if let Value::Object(map) = &mut data {
+        map.remove("id");
+    }
+    data
+}
+
+fn restore_app_id(mut data: Value, id: Uuid) -> Value {
+    if let Value::Object(map) = &mut data {
+        map.insert("id".into(), Value::String(id.to_string()));
+    }
+    data
+}
+
+fn json_to_map(v: Value) -> Result<serde_json::Map<String, Value>, StoreError> {
+    match v {
+        Value::Object(map) => Ok(map),
+        _ => Err(StoreError::Backend(
+            "SurrealStore expects object-shaped records".into(),
+        )),
+    }
+}
+
+fn map_err(e: surrealdb::Error) -> StoreError {
+    StoreError::Backend(e.to_string())
+}
+
+impl Store for SurrealStore {
+    fn load(&self, entity: &str, id: Uuid) -> Option<Value> {
+        let entity = entity.to_string();
+        let id_str = id.to_string();
+        self.runtime.block_on(async {
+            // `OMIT id` skips SurrealDB's Thing-typed id which serde_json::Value
+            // can't represent; we restore the application id ourselves.
+            let mut response = self
+                .db
+                .query("SELECT * OMIT id FROM type::thing($table, $id)")
+                .bind(("table", entity))
+                .bind(("id", id_str))
+                .await
+                .ok()?;
+            let rows: Vec<Value> = response.take(0).ok()?;
+            let row = rows.into_iter().next()?;
+            Some(restore_app_id(row, id))
+        })
+    }
+
+    fn seed(&mut self, entity: &str, id: Uuid, data: Value) {
+        let stripped = strip_app_id(data);
+        let map = json_to_map(stripped).expect("seed data is object-shaped");
+        let entity = entity.to_string();
+        let id_str = id.to_string();
+        self.runtime.block_on(async {
+            self.db
+                .query("UPSERT type::thing($table, $id) CONTENT $data")
+                .bind(("table", entity))
+                .bind(("id", id_str))
+                .bind(("data", map))
+                .await
+                .and_then(|r| r.check())
+                .expect("seed upsert");
+        });
+    }
+
+    fn apply_dry_run(&self, ops: &[FieldOp]) -> Result<(), StoreError> {
+        self.runtime.block_on(async {
+            for op in ops {
+                match op {
+                    FieldOp::Set { path, .. } => {
+                        let exists = self.exists(&path.entity, path.id).await?;
+                        if !exists {
+                            return Err(StoreError::NotFound(
+                                path.entity.clone(),
+                                path.id,
+                            ));
+                        }
+                        // We don't model NotAnObject for SurrealStore: every
+                        // record stored via this trait is map-shaped by
+                        // construction (json_to_map enforces it on write).
+                    }
+                    FieldOp::Create { entity, id, .. } => {
+                        if self.exists(entity, *id).await? {
+                            return Err(StoreError::Conflict(entity.clone(), *id));
+                        }
+                    }
+                    FieldOp::Delete { entity, id } => {
+                        if !self.exists(entity, *id).await? {
+                            return Err(StoreError::NotFound(entity.clone(), *id));
+                        }
+                    }
+                }
+            }
+            Ok(())
+        })
+    }
+
+    fn iter(&self) -> Result<Box<dyn Iterator<Item = (String, Uuid, Value)> + '_>, StoreError> {
+        // One query per table: pull the application id alongside every
+        // other field via an alias, strip the SurrealDB-typed `id` via
+        // OMIT, then restore the application `id` field in code so the
+        // output is byte-identical to what `load()` produces (cross-
+        // backend hash equality and the `iter ↔ load` parity contract
+        // both depend on this).
+        //
+        // Filters runtime metadata tables (META_TABLE_PREFIX) so client
+        // views never leak internal bookkeeping.
+        self.runtime.block_on(async {
+            let mut info = self
+                .db
+                .query("INFO FOR DB")
+                .await
+                .and_then(|r| r.check())
+                .map_err(map_err)?;
+            let row: Option<Value> = info.take(0).map_err(map_err)?;
+            let tables: Vec<String> = row
+                .as_ref()
+                .and_then(|v| v.get("tables"))
+                .and_then(|v| v.as_object())
+                .map(|m| {
+                    m.keys()
+                        .filter(|k| !k.starts_with(META_TABLE_PREFIX))
+                        .cloned()
+                        .collect()
+                })
+                .unwrap_or_default();
+
+            let mut out: Vec<(String, Uuid, Value)> = Vec::new();
+            for table in &tables {
+                // The alias is parameterised in the SELECT clause so the
+                // SurrealQL parser sees a literal field name; we can't
+                // bind it as a parameter (only values bind, not
+                // identifiers), but it's a compile-time constant so
+                // there's no injection surface.
+                let select = format!(
+                    "SELECT meta::id(id) AS {alias}, * OMIT id FROM type::table($t)",
+                    alias = ITER_ID_ALIAS,
+                );
+                let mut resp = self
+                    .db
+                    .query(&select)
+                    .bind(("t", table.clone()))
+                    .await
+                    .and_then(|r| r.check())
+                    .map_err(map_err)?;
+                let rows: Vec<Value> = resp.take(0).map_err(map_err)?;
+                for row in rows {
+                    let Value::Object(mut map) = row else {
+                        return Err(StoreError::Backend(format!(
+                            "row in table {} is not an object",
+                            table
+                        )));
+                    };
+                    let app_id_str = match map.remove(ITER_ID_ALIAS) {
+                        Some(Value::String(s)) => s,
+                        _ => {
+                            return Err(StoreError::Backend(format!(
+                                "row in table {} missing alias `{}`",
+                                table, ITER_ID_ALIAS
+                            )));
+                        }
+                    };
+                    let id = Uuid::parse_str(&app_id_str).map_err(|e| {
+                        StoreError::Backend(format!(
+                            "non-uuid id in table {}: {} ({})",
+                            table, app_id_str, e
+                        ))
+                    })?;
+                    // Match `restore_app_id`: insert the application id
+                    // back as a regular `id: <uuid_str>` field. Callers
+                    // reading the row see exactly what `load()` returns.
+                    map.insert("id".into(), Value::String(app_id_str));
+                    out.push((table.clone(), id, Value::Object(map)));
+                }
+            }
+            out.sort_by(|a, b| a.0.cmp(&b.0).then_with(|| a.1.as_bytes().cmp(b.1.as_bytes())));
+            Ok(Box::new(out.into_iter())
+                as Box<dyn Iterator<Item = (String, Uuid, Value)>>)
+        })
+    }
+
+    fn clear(&mut self) -> Result<(), StoreError> {
+        // Wipes EVERY table including the runtime meta table — a
+        // cleared store must report `last_applied_seq() == None`.
+        self.runtime.block_on(async {
+            let mut info = self
+                .db
+                .query("INFO FOR DB")
+                .await
+                .and_then(|r| r.check())
+                .map_err(map_err)?;
+            let row: Option<Value> = info.take(0).map_err(map_err)?;
+            let tables = row
+                .as_ref()
+                .and_then(|v| v.get("tables"))
+                .and_then(|v| v.as_object());
+            let names: Vec<String> = match tables {
+                Some(map) => map.keys().cloned().collect(),
+                None => Vec::new(),
+            };
+            for name in names {
+                self.db
+                    .query("DELETE FROM type::table($t)")
+                    .bind(("t", name))
+                    .await
+                    .and_then(|r| r.check())
+                    .map_err(map_err)?;
+            }
+            Ok(())
+        })
+    }
+
+    fn last_applied_seq(&self) -> Result<Option<u64>, StoreError> {
+        self.runtime.block_on(async {
+            let mut resp = self
+                .db
+                .query("SELECT VALUE last_applied_seq FROM type::thing($t, $id)")
+                .bind(("t", META_TABLE))
+                .bind(("id", META_SINGLETON_ID))
+                .await
+                .and_then(|r| r.check())
+                .map_err(map_err)?;
+            // The query yields either zero rows (no meta record yet) or
+            // one row containing the i64 value.
+            let rows: Vec<i64> = resp.take(0).map_err(map_err)?;
+            Ok(rows.into_iter().next().map(|v| v as u64))
+        })
+    }
+
+    fn set_last_applied_seq(&mut self, seq: u64) -> Result<(), StoreError> {
+        let seq_signed = seq as i64;
+        self.runtime.block_on(async {
+            self.db
+                .query("UPSERT type::thing($t, $id) CONTENT { last_applied_seq: $seq }")
+                .bind(("t", META_TABLE))
+                .bind(("id", META_SINGLETON_ID))
+                .bind(("seq", seq_signed))
+                .await
+                .and_then(|r| r.check())
+                .map_err(map_err)?;
+            Ok(())
+        })
+    }
+
+    fn apply(&mut self, ops: &[FieldOp]) -> Result<(), StoreError> {
+        self.apply_dry_run(ops)?;
+        self.runtime.block_on(async {
+            for op in ops {
+                match op {
+                    FieldOp::Set { path, value } => {
+                        let mut patch = serde_json::Map::new();
+                        patch.insert(path.field.clone(), value.clone());
+                        self.db
+                            .query("UPDATE type::thing($table, $id) MERGE $patch")
+                            .bind(("table", path.entity.clone()))
+                            .bind(("id", path.id.to_string()))
+                            .bind(("patch", patch))
+                            .await
+                            .and_then(|r| r.check())
+                            .map_err(map_err)?;
+                    }
+                    FieldOp::Create { entity, id, data } => {
+                        let stripped = strip_app_id(data.clone());
+                        let map = json_to_map(stripped)?;
+                        self.db
+                            .query("CREATE type::thing($table, $id) CONTENT $data")
+                            .bind(("table", entity.clone()))
+                            .bind(("id", id.to_string()))
+                            .bind(("data", map))
+                            .await
+                            .and_then(|r| r.check())
+                            .map_err(map_err)?;
+                    }
+                    FieldOp::Delete { entity, id } => {
+                        self.db
+                            .query("DELETE type::thing($table, $id)")
+                            .bind(("table", entity.clone()))
+                            .bind(("id", id.to_string()))
+                            .await
+                            .and_then(|r| r.check())
+                            .map_err(map_err)?;
+                    }
+                }
+            }
+            Ok(())
+        })
+    }
+}
+
+impl SurrealStore {
+    async fn exists(&self, entity: &str, id: Uuid) -> Result<bool, StoreError> {
+        let mut response = self
+            .db
+            .query("SELECT * OMIT id FROM type::thing($table, $id)")
+            .bind(("table", entity.to_string()))
+            .bind(("id", id.to_string()))
+            .await
+            .map_err(map_err)?;
+        let rows: Vec<Value> = response.take(0).map_err(map_err)?;
+        Ok(!rows.is_empty())
+    }
+}
diff --git a/crates/modules/nakui/core/tests/drift.rs b/crates/modules/nakui/core/tests/drift.rs
new file mode 100644
index 0000000..5c0c10a
--- /dev/null
+++ b/crates/modules/nakui/core/tests/drift.rs
@@ -0,0 +1,258 @@
+//! End-to-end drift detector: spin up `run_server` against log A, run
+//! `check_against_socket` first against the same log (in-sync) and then
+//! against a divergent log B (drift detected, with the expected diff
+//! list).
+//!
+//! Same threading inversion as `tests/run.rs`: server on main thread
+//! (Executor is `!Send`), client on a worker thread.
+
+use std::io::{BufRead, BufReader, Write};
+use std::os::unix::net::UnixStream;
+use std::path::{Path, PathBuf};
+use std::thread;
+
+use nakui_core::drift::{DriftDiff, check_against_socket};
+use nakui_core::event_log::{EventLog, execute_and_log, seed_and_log};
+use nakui_core::executor::Executor;
+use nakui_core::run::run_server;
+use nakui_core::store::MemoryStore;
+use serde_json::json;
+use uuid::Uuid;
+
+fn workspace_root() -> PathBuf {
+    Path::new(env!("CARGO_MANIFEST_DIR"))
+        .parent()
+        .expect("workspace root above core/")
+        .to_path_buf()
+}
+
+fn treasury_module() -> PathBuf {
+    workspace_root().join("modules/treasury")
+}
+
+fn fresh_log_path() -> PathBuf {
+    std::env::temp_dir().join(format!("nakui_drift_log_{}.jsonl", Uuid::new_v4()))
+}
+
+fn fresh_socket_path() -> PathBuf {
+    std::env::temp_dir().join(format!("nakui_drift_{}.sock", Uuid::new_v4()))
+}
+
+/// Build a real WAL-formed log: two cajas seeded + one deposit.
+fn build_log_a(path: &Path, caja_a: Uuid, caja_b: Uuid) {
+    let executor = Executor::load_module(treasury_module()).expect("load");
+    let mut log = EventLog::open(path).expect("open log");
+    let mut store = MemoryStore::new();
+    seed_and_log(
+        &executor,
+        &mut store,
+        &mut log,
+        "Caja",
+        caja_a,
+        json!({"id": caja_a.to_string(), "name": "A", "saldo": 100_000_i64, "currency": "USD"}),
+    )
+    .unwrap();
+    seed_and_log(
+        &executor,
+        &mut store,
+        &mut log,
+        "Caja",
+        caja_b,
+        json!({"id": caja_b.to_string(), "name": "B", "saldo": 50_000_i64, "currency": "USD"}),
+    )
+    .unwrap();
+    execute_and_log(
+        &executor,
+        &mut store,
+        &mut log,
+        "register_cash_move",
+        &[("caja", caja_a)],
+        json!({
+            "monto": 5_000_i64,
+            "tipo": "in",
+            "timestamp": "2026-05-04T10:00:00Z",
+            "memo": "x",
+            "movimiento_id": Uuid::new_v4().to_string(),
+        }),
+    )
+    .unwrap();
+}
+
+/// Build a divergent log: only caja_a seeded, no deposit, no caja_b.
+/// Replaying B produces a different state than the server (which used A).
+fn build_log_b(path: &Path, caja_a: Uuid) {
+    let executor = Executor::load_module(treasury_module()).expect("load");
+    let mut log = EventLog::open(path).expect("open log b");
+    let mut store = MemoryStore::new();
+    seed_and_log(
+        &executor,
+        &mut store,
+        &mut log,
+        "Caja",
+        caja_a,
+        json!({"id": caja_a.to_string(), "name": "A", "saldo": 100_000_i64, "currency": "USD"}),
+    )
+    .unwrap();
+}
+
+/// Wait for the socket to exist and be connectable, then return a
+/// connected stream. Used by helpers that send raw requests bypassing
+/// `check_against_socket` (e.g. shutdown).
+fn connect_with_retry(path: &Path) -> UnixStream {
+    for _ in 0..100 {
+        if let Ok(s) = UnixStream::connect(path) {
+            return s;
+        }
+        thread::sleep(std::time::Duration::from_millis(20));
+    }
+    panic!("server never started accepting on {}", path.display());
+}
+
+fn send_shutdown(socket_path: &Path) {
+    let mut stream = connect_with_retry(socket_path);
+    stream.write_all(b"{\"op\":\"shutdown\"}\n").unwrap();
+    let mut reader = BufReader::new(stream.try_clone().unwrap());
+    let mut line = String::new();
+    reader.read_line(&mut line).unwrap();
+}
+
+#[test]
+fn drift_check_reports_in_sync_when_log_matches_server() {
+    let log_path = fresh_log_path();
+    let socket_path = fresh_socket_path();
+
+    let caja_a = Uuid::new_v4();
+    let caja_b = Uuid::new_v4();
+    build_log_a(&log_path, caja_a, caja_b);
+
+    let executor = Executor::load_module(treasury_module()).expect("load");
+    let log = EventLog::open(&log_path).expect("reopen");
+    let store = MemoryStore::new();
+
+    let socket_for_client = socket_path.clone();
+    let log_for_client = log_path.clone();
+    let client = thread::spawn(move || -> Result<(), String> {
+        let report = check_against_socket(&log_for_client, &socket_for_client)
+            .map_err(|e| format!("check failed: {}", e))?;
+        if !report.in_sync() {
+            return Err(format!(
+                "expected in_sync, got {} diffs: {:?}",
+                report.diffs.len(),
+                report.diffs
+            ));
+        }
+        if report.log_hash != report.server_hash {
+            return Err("hashes diverged with empty diff — invariant broken".into());
+        }
+        if report.log_records != report.server_records {
+            return Err(format!(
+                "record count diverged: log={} server={}",
+                report.log_records, report.server_records
+            ));
+        }
+        send_shutdown(&socket_for_client);
+        Ok(())
+    });
+
+    run_server(executor, log, store, None, &socket_path).expect("server clean exit");
+    client.join().unwrap().expect("client assertions");
+
+    let _ = std::fs::remove_file(&log_path);
+}
+
+#[test]
+fn drift_check_surfaces_expected_per_record_diffs() {
+    let log_a_path = fresh_log_path();
+    let log_b_path = fresh_log_path();
+    let socket_path = fresh_socket_path();
+
+    let caja_a = Uuid::new_v4();
+    let caja_b = Uuid::new_v4();
+    build_log_a(&log_a_path, caja_a, caja_b);
+    build_log_b(&log_b_path, caja_a);
+
+    let executor = Executor::load_module(treasury_module()).expect("load");
+    let log = EventLog::open(&log_a_path).expect("reopen");
+    let store = MemoryStore::new();
+
+    let socket_for_client = socket_path.clone();
+    let log_b_for_client = log_b_path.clone();
+    let client = thread::spawn(move || -> Result<(), String> {
+        // Server is running log A's state; we audit using log B's
+        // canonical view. Expected diffs:
+        //   - Caja caja_a: tampered (B says saldo=100_000, server has 105_000 from deposit)
+        //   - Caja caja_b: only_on_server (B never seeded it)
+        //   - Movimiento <some uuid>: only_on_server (B never executed the deposit)
+        let report = check_against_socket(&log_b_for_client, &socket_for_client)
+            .map_err(|e| format!("check failed: {}", e))?;
+        if report.in_sync() {
+            return Err("expected drift, got in_sync".into());
+        }
+
+        let mut tampered = 0;
+        let mut only_on_server = 0;
+        let mut only_in_log = 0;
+        let mut tampered_caja_a = false;
+        let mut server_extra_caja_b = false;
+        let mut server_extra_movimiento = false;
+
+        for d in &report.diffs {
+            match d {
+                DriftDiff::Tampered {
+                    entity,
+                    id,
+                    log_value,
+                    server_value,
+                } => {
+                    tampered += 1;
+                    if entity == "Caja" && *id == caja_a {
+                        tampered_caja_a = true;
+                        if log_value["saldo"] != json!(100_000_i64) {
+                            return Err(format!("log saldo wrong: {}", log_value));
+                        }
+                        if server_value["saldo"] != json!(105_000_i64) {
+                            return Err(format!("server saldo wrong: {}", server_value));
+                        }
+                    }
+                }
+                DriftDiff::OnlyOnServer { entity, id, .. } => {
+                    only_on_server += 1;
+                    if entity == "Caja" && *id == caja_b {
+                        server_extra_caja_b = true;
+                    }
+                    if entity == "Movimiento" {
+                        server_extra_movimiento = true;
+                    }
+                }
+                DriftDiff::OnlyInLog { .. } => only_in_log += 1,
+            }
+        }
+        if tampered != 1 {
+            return Err(format!("expected 1 tampered, got {}", tampered));
+        }
+        if only_on_server != 2 {
+            return Err(format!("expected 2 only_on_server, got {}", only_on_server));
+        }
+        if only_in_log != 0 {
+            return Err(format!("expected 0 only_in_log, got {}", only_in_log));
+        }
+        if !tampered_caja_a {
+            return Err("expected tampered diff for caja_a".into());
+        }
+        if !server_extra_caja_b {
+            return Err("expected only_on_server diff for caja_b".into());
+        }
+        if !server_extra_movimiento {
+            return Err("expected only_on_server diff for some Movimiento".into());
+        }
+
+        send_shutdown(&socket_for_client);
+        Ok(())
+    });
+
+    run_server(executor, log, store, None, &socket_path).expect("server clean exit");
+    client.join().unwrap().expect("client assertions");
+
+    let _ = std::fs::remove_file(&log_a_path);
+    let _ = std::fs::remove_file(&log_b_path);
+}
diff --git a/crates/modules/nakui/core/tests/event_log.rs b/crates/modules/nakui/core/tests/event_log.rs
new file mode 100644
index 0000000..d943c74
--- /dev/null
+++ b/crates/modules/nakui/core/tests/event_log.rs
@@ -0,0 +1,620 @@
+//! Integration tests for the event log: round-trip persistence,
+//! replay-equivalence with the live store, and determinism verification.
+
+use std::path::{Path, PathBuf};
+
+use nakui_core::delta::FieldOp;
+use nakui_core::event_log::{
+    EventLog, ExecuteError, LogEntry, RecoverableExecuteError, Snapshot, execute_and_log,
+    execute_and_log_with_recovery, reconcile, replay, replay_with_snapshot_into, seed_and_log,
+    verify_log,
+};
+use nakui_core::executor::Executor;
+use nakui_core::store::{MemoryStore, Store, StoreError};
+use serde_json::{Value, json};
+use uuid::Uuid;
+
+fn workspace_root() -> PathBuf {
+    Path::new(env!("CARGO_MANIFEST_DIR"))
+        .parent()
+        .expect("workspace root above core/")
+        .to_path_buf()
+}
+
+fn treasury_module() -> PathBuf {
+    workspace_root().join("modules/treasury")
+}
+
+fn fresh_log_path() -> PathBuf {
+    std::env::temp_dir().join(format!("nakui_test_{}.jsonl", Uuid::new_v4()))
+}
+
+#[test]
+fn replay_reconstructs_live_store() {
+    let exec = Executor::load_module(treasury_module()).expect("load module");
+    let log_path = fresh_log_path();
+    let mut log = EventLog::open(&log_path).expect("open log");
+    let mut live = MemoryStore::new();
+
+    let a = Uuid::new_v4();
+    let b = Uuid::new_v4();
+    seed_and_log(
+        &exec,
+        &mut live,
+        &mut log,
+        "Caja",
+        a,
+        json!({
+            "id": a.to_string(), "name": "A", "saldo": 200_000_i64, "currency": "USD",
+        }),
+    )
+    .unwrap();
+    seed_and_log(
+        &exec,
+        &mut live,
+        &mut log,
+        "Caja",
+        b,
+        json!({
+            "id": b.to_string(), "name": "B", "saldo": 50_000_i64, "currency": "USD",
+        }),
+    )
+    .unwrap();
+
+    let mov_id = Uuid::new_v4();
+    execute_and_log(
+        &exec,
+        &mut live,
+        &mut log,
+        "register_cash_move",
+        &[("caja", a)],
+        json!({
+            "monto": 25_000_i64, "tipo": "in",
+            "timestamp": "2026-05-04T10:00:00Z", "memo": "x",
+            "movimiento_id": mov_id.to_string(),
+        }),
+    )
+    .unwrap();
+
+    let xfer_id = Uuid::new_v4();
+    execute_and_log(
+        &exec,
+        &mut live,
+        &mut log,
+        "transfer_between_cajas",
+        &[("source", a), ("dest", b)],
+        json!({
+            "monto": 75_000_i64,
+            "timestamp": "2026-05-04T10:30:00Z", "memo": "xf",
+            "transfer_id": xfer_id.to_string(),
+        }),
+    )
+    .unwrap();
+
+    // Failed morphism — should NOT be logged.
+    let attempt = execute_and_log(
+        &exec,
+        &mut live,
+        &mut log,
+        "transfer_between_cajas",
+        &[("source", a), ("dest", b)],
+        json!({
+            "monto": 999_999_999_i64,
+            "timestamp": "2026-05-04T10:45:00Z", "memo": "overdraw",
+            "transfer_id": Uuid::new_v4().to_string(),
+        }),
+    );
+    assert!(matches!(attempt, Err(ExecuteError::PreLog(_))));
+
+    let replayed = replay(&log).expect("replay");
+    assert_eq!(live, replayed, "replayed store must equal live store");
+
+    // Failed attempt left no trace in the log.
+    let entries = log.entries().unwrap();
+    assert_eq!(
+        entries.len(),
+        4,
+        "2 seeds + 2 successful morphisms = 4 entries; got {}",
+        entries.len()
+    );
+
+    let _ = std::fs::remove_file(&log_path);
+}
+
+#[test]
+fn verify_log_passes_for_deterministic_morphisms() {
+    let exec = Executor::load_module(treasury_module()).expect("load module");
+    let log_path = fresh_log_path();
+    let mut log = EventLog::open(&log_path).expect("open log");
+    let mut live = MemoryStore::new();
+
+    let a = Uuid::new_v4();
+    let b = Uuid::new_v4();
+    seed_and_log(
+        &exec,
+        &mut live,
+        &mut log,
+        "Caja",
+        a,
+        json!({"id": a.to_string(), "name": "A", "saldo": 200_000_i64, "currency": "USD"}),
+    )
+    .unwrap();
+    seed_and_log(
+        &exec,
+        &mut live,
+        &mut log,
+        "Caja",
+        b,
+        json!({"id": b.to_string(), "name": "B", "saldo": 50_000_i64, "currency": "USD"}),
+    )
+    .unwrap();
+    execute_and_log(
+        &exec,
+        &mut live,
+        &mut log,
+        "transfer_between_cajas",
+        &[("source", a), ("dest", b)],
+        json!({
+            "monto": 25_000_i64,
+            "timestamp": "2026-05-04T11:00:00Z", "memo": "v",
+            "transfer_id": Uuid::new_v4().to_string(),
+        }),
+    )
+    .unwrap();
+
+    verify_log(&log, &exec).expect("re-execution must produce identical ops");
+
+    let _ = std::fs::remove_file(&log_path);
+}
+
+/// Store wrapper that passes dry_run through to MemoryStore but always
+/// fails on apply. Used to simulate a transient backend failure landing
+/// AFTER the kernel has validated and the log has been written.
+struct FailOnApplyStore {
+    inner: MemoryStore,
+}
+
+impl Store for FailOnApplyStore {
+    fn load(&self, entity: &str, id: Uuid) -> Option<Value> {
+        self.inner.load(entity, id)
+    }
+    fn seed(&mut self, entity: &str, id: Uuid, data: Value) {
+        self.inner.seed(entity, id, data);
+    }
+    fn apply_dry_run(&self, ops: &[FieldOp]) -> Result<(), StoreError> {
+        self.inner.apply_dry_run(ops)
+    }
+    fn apply(&mut self, _ops: &[FieldOp]) -> Result<(), StoreError> {
+        Err(StoreError::NotFound(
+            "synthetic_apply_failure".into(),
+            Uuid::nil(),
+        ))
+    }
+    fn clear(&mut self) -> Result<(), StoreError> {
+        self.inner.clear()
+    }
+    fn iter(&self) -> Result<Box<dyn Iterator<Item = (String, Uuid, Value)> + '_>, StoreError> {
+        self.inner.iter()
+    }
+}
+
+#[test]
+fn post_log_store_failure_leaves_log_canonical() {
+    let exec = Executor::load_module(treasury_module()).expect("load module");
+    let log_path = fresh_log_path();
+    let mut log = EventLog::open(&log_path).expect("open log");
+
+    // Seed the inner store directly (no logging — we're simulating the
+    // backend independently of the log).
+    let mut inner = MemoryStore::new();
+    let a = Uuid::new_v4();
+    let b = Uuid::new_v4();
+    inner.seed(
+        "Caja",
+        a,
+        json!({"id": a.to_string(), "name": "A", "saldo": 200_000_i64, "currency": "USD"}),
+    );
+    inner.seed(
+        "Caja",
+        b,
+        json!({"id": b.to_string(), "name": "B", "saldo": 50_000_i64, "currency": "USD"}),
+    );
+    let mut store = FailOnApplyStore { inner };
+
+    let result = execute_and_log(
+        &exec,
+        &mut store,
+        &mut log,
+        "transfer_between_cajas",
+        &[("source", a), ("dest", b)],
+        json!({
+            "monto": 25_000_i64,
+            "timestamp": "2026-05-04T11:00:00Z",
+            "memo": "wal-test",
+            "transfer_id": Uuid::new_v4().to_string(),
+        }),
+    );
+
+    match result {
+        Err(ExecuteError::PostLogStore(_)) => {}
+        other => panic!("expected PostLogStore, got {:?}", other),
+    }
+
+    // Log is canonical: the morphism event is durable.
+    let entries = log.entries().expect("read");
+    assert_eq!(entries.len(), 1, "log must contain the morphism event");
+    assert!(matches!(&entries[0], LogEntry::Morphism { .. }));
+
+    // Live store is stale: apply was rejected, so saldos are unchanged.
+    assert_eq!(
+        store.load("Caja", a).unwrap().get("saldo").unwrap().as_i64(),
+        Some(200_000)
+    );
+    assert_eq!(
+        store.load("Caja", b).unwrap().get("saldo").unwrap().as_i64(),
+        Some(50_000)
+    );
+
+    let _ = std::fs::remove_file(&log_path);
+}
+
+#[test]
+fn reopen_log_resumes_from_correct_seq() {
+    let exec = Executor::load_module(treasury_module()).expect("load module");
+    let log_path = fresh_log_path();
+    let a = Uuid::new_v4();
+
+    {
+        let mut log = EventLog::open(&log_path).unwrap();
+        let mut store = MemoryStore::new();
+        seed_and_log(
+            &exec,
+            &mut store,
+            &mut log,
+            "Caja",
+            a,
+            json!({"id": a.to_string(), "name": "A", "saldo": 100_i64, "currency": "USD"}),
+        )
+        .unwrap();
+        assert_eq!(log.next_seq(), 1);
+    }
+
+    {
+        let log = EventLog::open(&log_path).unwrap();
+        assert_eq!(log.next_seq(), 1, "next_seq must persist across reopens");
+        let entries = log.entries().unwrap();
+        assert_eq!(entries.len(), 1);
+        assert!(matches!(&entries[0], LogEntry::Seed { seq: 0, .. }));
+    }
+
+    let _ = std::fs::remove_file(&log_path);
+}
+
+#[test]
+fn snapshot_plus_log_tail_replays_to_same_state() {
+    let exec = Executor::load_module(treasury_module()).expect("load");
+    let log_path = fresh_log_path();
+    let snap_path = log_path.with_extension("snap");
+    let mut log = EventLog::open(&log_path).expect("open");
+    let mut live = MemoryStore::new();
+
+    let a = Uuid::new_v4();
+    let b = Uuid::new_v4();
+    seed_and_log(
+        &exec,
+        &mut live,
+        &mut log,
+        "Caja",
+        a,
+        json!({"id": a.to_string(), "name": "A", "saldo": 200_000_i64, "currency": "USD"}),
+    )
+    .unwrap();
+    seed_and_log(
+        &exec,
+        &mut live,
+        &mut log,
+        "Caja",
+        b,
+        json!({"id": b.to_string(), "name": "B", "saldo": 50_000_i64, "currency": "USD"}),
+    )
+    .unwrap();
+    execute_and_log(
+        &exec,
+        &mut live,
+        &mut log,
+        "register_cash_move",
+        &[("caja", a)],
+        json!({
+            "monto": 25_000_i64, "tipo": "in",
+            "timestamp": "2026-05-04T10:00:00Z", "memo": "before-snap",
+            "movimiento_id": Uuid::new_v4().to_string(),
+        }),
+    )
+    .unwrap();
+
+    // Take snapshot at this point: seq 0 (seed A), 1 (seed B), 2 (deposit)
+    // are reflected in `live`. Next event will be seq 3.
+    let snap = Snapshot::from_memory_store(&live, log.next_seq() - 1);
+    snap.write(&snap_path).expect("write snapshot");
+    assert_eq!(snap.seq, 2);
+
+    // More events after the snapshot.
+    execute_and_log(
+        &exec,
+        &mut live,
+        &mut log,
+        "transfer_between_cajas",
+        &[("source", a), ("dest", b)],
+        json!({
+            "monto": 75_000_i64,
+            "timestamp": "2026-05-04T10:30:00Z", "memo": "after-snap",
+            "transfer_id": Uuid::new_v4().to_string(),
+        }),
+    )
+    .unwrap();
+
+    // Replay from snapshot + log tail; must equal live store.
+    let loaded_snap = Snapshot::load(&snap_path).expect("load").expect("present");
+    let mut replayed = MemoryStore::new();
+    replay_with_snapshot_into(&log, Some(&loaded_snap), &mut replayed).expect("replay");
+
+    assert_eq!(live, replayed, "snapshot + tail must equal full replay");
+
+    let _ = std::fs::remove_file(&log_path);
+    let _ = std::fs::remove_file(&snap_path);
+}
+
+#[test]
+fn compact_through_drops_old_entries_keeps_seq() {
+    let exec = Executor::load_module(treasury_module()).expect("load module");
+    let log_path = fresh_log_path();
+    let mut log = EventLog::open(&log_path).expect("open");
+
+    let mut live = MemoryStore::new();
+    for i in 0..5 {
+        let id = Uuid::new_v4();
+        seed_and_log(
+            &exec,
+            &mut live,
+            &mut log,
+            "Caja",
+            id,
+            json!({"id": id.to_string(), "name": format!("c{}", i), "saldo": 100_i64, "currency": "USD"}),
+        )
+        .unwrap();
+    }
+
+    assert_eq!(log.next_seq(), 5);
+    assert_eq!(log.entries().unwrap().len(), 5);
+
+    // Compact through seq 2: entries 0,1,2 are dropped; 3,4 remain.
+    log.compact_through(2).expect("compact");
+
+    let surviving = log.entries().unwrap();
+    assert_eq!(surviving.len(), 2);
+    assert_eq!(surviving[0].seq(), 3);
+    assert_eq!(surviving[1].seq(), 4);
+
+    // next_seq stays at 5 — we kept the surviving entries' counter intact.
+    // (Reopen to confirm the persisted log roundtrips this.)
+    drop(log);
+    let reopened = EventLog::open(&log_path).expect("reopen after compact");
+    assert_eq!(reopened.next_seq(), 5);
+
+    let _ = std::fs::remove_file(&log_path);
+}
+
+#[test]
+fn snapshot_then_compact_then_replay_equals_pre_compaction() {
+    let exec = Executor::load_module(treasury_module()).expect("load");
+    let log_path = fresh_log_path();
+    let snap_path = log_path.with_extension("snap");
+    let mut log = EventLog::open(&log_path).expect("open");
+    let mut live = MemoryStore::new();
+
+    let a = Uuid::new_v4();
+    seed_and_log(
+        &exec,
+        &mut live,
+        &mut log,
+        "Caja",
+        a,
+        json!({"id": a.to_string(), "name": "A", "saldo": 1_000_i64, "currency": "USD"}),
+    )
+    .unwrap();
+    for i in 0..3 {
+        execute_and_log(
+            &exec,
+            &mut live,
+            &mut log,
+            "register_cash_move",
+            &[("caja", a)],
+            json!({
+                "monto": 100_i64, "tipo": "in",
+                "timestamp": format!("2026-05-04T10:0{}:00Z", i), "memo": "x",
+                "movimiento_id": Uuid::new_v4().to_string(),
+            }),
+        )
+        .unwrap();
+    }
+    // Snapshot at seq 3 (1 seed + 3 morphisms = seqs 0..=3).
+    let snap = Snapshot::from_memory_store(&live, log.next_seq() - 1);
+    snap.write(&snap_path).expect("write snap");
+    log.compact_through(snap.seq).expect("compact");
+
+    // After compaction: log has 0 entries (all subsumed). next_seq = 4.
+    assert_eq!(log.entries().unwrap().len(), 0);
+
+    // More events after compaction.
+    execute_and_log(
+        &exec,
+        &mut live,
+        &mut log,
+        "register_cash_move",
+        &[("caja", a)],
+        json!({
+            "monto": 500_i64, "tipo": "in",
+            "timestamp": "2026-05-04T11:00:00Z", "memo": "post-compact",
+            "movimiento_id": Uuid::new_v4().to_string(),
+        }),
+    )
+    .unwrap();
+
+    // Reconstruct from snapshot + remaining log.
+    let loaded_snap = Snapshot::load(&snap_path).unwrap().unwrap();
+    let mut replayed = MemoryStore::new();
+    replay_with_snapshot_into(&log, Some(&loaded_snap), &mut replayed).expect("replay");
+    assert_eq!(live, replayed, "snapshot + post-compact log must equal live");
+
+    let _ = std::fs::remove_file(&log_path);
+    let _ = std::fs::remove_file(&snap_path);
+}
+
+#[test]
+fn reconcile_rebuilds_drifted_store_from_log() {
+    let exec = Executor::load_module(treasury_module()).expect("load module");
+    let log_path = fresh_log_path();
+    let mut log = EventLog::open(&log_path).expect("open log");
+    let mut live = MemoryStore::new();
+
+    let a = Uuid::new_v4();
+    seed_and_log(
+        &exec,
+        &mut live,
+        &mut log,
+        "Caja",
+        a,
+        json!({"id": a.to_string(), "name": "A", "saldo": 100_000_i64, "currency": "USD"}),
+    )
+    .unwrap();
+    execute_and_log(
+        &exec,
+        &mut live,
+        &mut log,
+        "register_cash_move",
+        &[("caja", a)],
+        json!({
+            "monto": 5_000_i64, "tipo": "in",
+            "timestamp": "2026-05-04T10:00:00Z", "memo": "x",
+            "movimiento_id": Uuid::new_v4().to_string(),
+        }),
+    )
+    .unwrap();
+
+    // Drift the store out-of-band: a poison record nobody logged, plus a
+    // tampered saldo on the legitimate one.
+    let ghost = Uuid::new_v4();
+    live.seed(
+        "Caja",
+        ghost,
+        json!({"id": ghost.to_string(), "name": "GHOST", "saldo": 0, "currency": "USD"}),
+    );
+    live.seed(
+        "Caja",
+        a,
+        json!({"id": a.to_string(), "name": "A", "saldo": 999_999_i64, "currency": "USD"}),
+    );
+
+    // Canonical state: replay from log into a clean store.
+    let canonical = replay(&log).expect("replay");
+    assert_ne!(live, canonical, "drift was set up to differ from log");
+
+    reconcile(&mut live, &log).expect("reconcile");
+    assert_eq!(live, canonical, "reconcile must restore log-canonical state");
+    assert!(live.load("Caja", ghost).is_none(), "poison record must be wiped");
+
+    let _ = std::fs::remove_file(&log_path);
+}
+
+#[test]
+fn execute_and_log_with_recovery_succeeds_on_clean_path() {
+    // The clean path: no apply failure means the wrapper returns the same
+    // ops as `execute_and_log` and leaves the store consistent.
+    let exec = Executor::load_module(treasury_module()).expect("load module");
+    let log_path = fresh_log_path();
+    let mut log = EventLog::open(&log_path).expect("open log");
+    let mut store = MemoryStore::new();
+
+    let a = Uuid::new_v4();
+    seed_and_log(
+        &exec,
+        &mut store,
+        &mut log,
+        "Caja",
+        a,
+        json!({"id": a.to_string(), "name": "A", "saldo": 10_000_i64, "currency": "USD"}),
+    )
+    .unwrap();
+
+    let ops = execute_and_log_with_recovery(
+        &exec,
+        &mut store,
+        &mut log,
+        "register_cash_move",
+        &[("caja", a)],
+        json!({
+            "monto": 1_000_i64, "tipo": "in",
+            "timestamp": "2026-05-04T10:00:00Z", "memo": "x",
+            "movimiento_id": Uuid::new_v4().to_string(),
+        }),
+    )
+    .expect("recovery wrapper");
+    assert!(!ops.is_empty(), "morphism produced ops");
+
+    let replayed = replay(&log).expect("replay");
+    assert_eq!(store, replayed, "store and log agree on clean path");
+
+    let _ = std::fs::remove_file(&log_path);
+}
+
+#[test]
+fn execute_and_log_with_recovery_reports_unrecoverable_when_replay_also_fails() {
+    // Apply is permanently broken — reconcile (which replays through apply)
+    // will also fail. The wrapper must surface `Unrecoverable` so the
+    // caller knows the store is no longer in sync with the log.
+    let exec = Executor::load_module(treasury_module()).expect("load module");
+    let log_path = fresh_log_path();
+    let mut log = EventLog::open(&log_path).expect("open log");
+
+    let mut inner = MemoryStore::new();
+    let a = Uuid::new_v4();
+    let b = Uuid::new_v4();
+    inner.seed(
+        "Caja",
+        a,
+        json!({"id": a.to_string(), "name": "A", "saldo": 200_000_i64, "currency": "USD"}),
+    );
+    inner.seed(
+        "Caja",
+        b,
+        json!({"id": b.to_string(), "name": "B", "saldo": 50_000_i64, "currency": "USD"}),
+    );
+    let mut store = FailOnApplyStore { inner };
+
+    let result = execute_and_log_with_recovery(
+        &exec,
+        &mut store,
+        &mut log,
+        "transfer_between_cajas",
+        &[("source", a), ("dest", b)],
+        json!({
+            "monto": 25_000_i64,
+            "timestamp": "2026-05-04T11:00:00Z",
+            "memo": "recover-fail",
+            "transfer_id": Uuid::new_v4().to_string(),
+        }),
+    );
+    assert!(
+        matches!(result, Err(RecoverableExecuteError::Unrecoverable { .. })),
+        "expected Unrecoverable, got {:?}",
+        result
+    );
+
+    // The log entry is still canonical: an operator who fixes the backend
+    // can recover via `nakui replay` later.
+    let entries = log.entries().expect("read log");
+    assert_eq!(entries.len(), 1);
+    assert!(matches!(&entries[0], LogEntry::Morphism { .. }));
+
+    let _ = std::fs::remove_file(&log_path);
+}
diff --git a/crates/modules/nakui/core/tests/fixtures/bad_created_record.rhai b/crates/modules/nakui/core/tests/fixtures/bad_created_record.rhai
new file mode 100644
index 0000000..4fec923
--- /dev/null
+++ b/crates/modules/nakui/core/tests/fixtures/bad_created_record.rhai
@@ -0,0 +1,19 @@
+// EVIL: creates a Movimiento with monto = -1, violating schema.k:
+//     check: monto > 0
+// Schema check on the Created record (KclPostCreate) must reject this.
+let mov_id = input.params.mov_id;
+[
+    #{
+        op: "create",
+        entity: "Movimiento",
+        id: mov_id,
+        data: #{
+            id: mov_id,
+            caja_id: input.ids.caja,
+            monto: -1,
+            tipo: "in",
+            timestamp: "2026-05-04T00:00:00Z",
+            memo: "evil",
+        },
+    },
+]
diff --git a/crates/modules/nakui/core/tests/fixtures/capability_violation.rhai b/crates/modules/nakui/core/tests/fixtures/capability_violation.rhai
new file mode 100644
index 0000000..696a44f
--- /dev/null
+++ b/crates/modules/nakui/core/tests/fixtures/capability_violation.rhai
@@ -0,0 +1,9 @@
+// EVIL: writes to a Caja id that wasn't declared in inputs.
+// The phantom id is passed via params to keep the script syntactically valid.
+[
+    #{
+        op: "set",
+        path: #{ entity: "Caja", id: input.params.phantom_id, field: "saldo" },
+        value: 0,
+    },
+]
diff --git a/crates/modules/nakui/core/tests/fixtures/conservation_violation.rhai b/crates/modules/nakui/core/tests/fixtures/conservation_violation.rhai
new file mode 100644
index 0000000..19084b5
--- /dev/null
+++ b/crates/modules/nakui/core/tests/fixtures/conservation_violation.rhai
@@ -0,0 +1,14 @@
+// EVIL: subtracts from BOTH cajas. Same currency, so the conservation rule
+// (Σ Δ Caja.saldo group_by currency = 0) catches it.
+[
+    #{
+        op: "set",
+        path: #{ entity: "Caja", id: input.ids.source, field: "saldo" },
+        value: input.states.source.saldo - 100,
+    },
+    #{
+        op: "set",
+        path: #{ entity: "Caja", id: input.ids.dest, field: "saldo" },
+        value: input.states.dest.saldo - 1,
+    },
+]
diff --git a/crates/modules/nakui/core/tests/fixtures/delete_primary.rhai b/crates/modules/nakui/core/tests/fixtures/delete_primary.rhai
new file mode 100644
index 0000000..87ab2a2
--- /dev/null
+++ b/crates/modules/nakui/core/tests/fixtures/delete_primary.rhai
@@ -0,0 +1,7 @@
+// Deletes its primary input. The kernel must:
+//   - accept the Delete op (token = "Caja", in writes)
+//   - skip the per-input KCL post-check (entity no longer exists)
+//   - allow apply to remove the record cleanly
+[
+    #{ op: "delete", entity: "Caja", id: input.ids.caja },
+]
diff --git a/crates/modules/nakui/core/tests/fixtures/entity_mismatch.rhai b/crates/modules/nakui/core/tests/fixtures/entity_mismatch.rhai
new file mode 100644
index 0000000..331f7d2
--- /dev/null
+++ b/crates/modules/nakui/core/tests/fixtures/entity_mismatch.rhai
@@ -0,0 +1,10 @@
+// EVIL: tries to write `Stock.cantidad` using a Caja's UUID. The id matches
+// a tracked role but the entity does not — the capability check must reject
+// with a `<entity-mismatch>` token rather than letting it through.
+[
+    #{
+        op: "set",
+        path: #{ entity: "Stock", id: input.ids.caja, field: "cantidad" },
+        value: 0,
+    },
+]
diff --git a/crates/modules/nakui/core/tests/graph.rs b/crates/modules/nakui/core/tests/graph.rs
new file mode 100644
index 0000000..da676a0
--- /dev/null
+++ b/crates/modules/nakui/core/tests/graph.rs
@@ -0,0 +1,355 @@
+//! ManifestGraph: cycle detection on `depends_on`, data-flow indexes for
+//! `reads`/`writes`, and the `affected_by` query that powers dirty-marking.
+
+use std::path::{Path, PathBuf};
+
+use nakui_core::executor::Executor;
+use nakui_core::graph::{DirtyTracker, GraphError, ManifestGraph};
+use nakui_core::manifest::{
+    ConserveRule, Invariants, Manifest, MorphismInput, MorphismSpec,
+};
+
+fn workspace_root() -> PathBuf {
+    Path::new(env!("CARGO_MANIFEST_DIR"))
+        .parent()
+        .expect("workspace root above core/")
+        .to_path_buf()
+}
+
+fn module(name: &str) -> PathBuf {
+    workspace_root().join("modules").join(name)
+}
+
+fn morphism(name: &str, depends_on: Vec<String>) -> MorphismSpec {
+    MorphismSpec {
+        name: name.into(),
+        inputs: vec![MorphismInput {
+            role: "caja".into(),
+            entity: "Caja".into(),
+        }],
+        reads: vec!["caja.saldo".into()],
+        writes: vec!["caja.saldo".into()],
+        invariants: Invariants::default(),
+        depends_on,
+        script: "morphisms/register_cash_move.rhai".into(),
+    }
+}
+
+fn manifest_with(morphisms: Vec<MorphismSpec>) -> Manifest {
+    Manifest {
+        module: "graph_test".into(),
+        schemas: vec![],
+        morphisms,
+    }
+}
+
+#[test]
+fn detects_two_node_cycle() {
+    let m = manifest_with(vec![
+        morphism("a", vec!["b".into()]),
+        morphism("b", vec!["a".into()]),
+    ]);
+    match ManifestGraph::build(&m) {
+        Err(GraphError::Cycle(names)) => {
+            assert!(names.contains(&"a".to_string()));
+            assert!(names.contains(&"b".to_string()));
+        }
+        other => panic!("expected Cycle, got {:?}", other),
+    }
+}
+
+#[test]
+fn detects_self_loop() {
+    let m = manifest_with(vec![morphism("loop", vec!["loop".into()])]);
+    match ManifestGraph::build(&m) {
+        Err(GraphError::Cycle(names)) => {
+            assert_eq!(names, vec!["loop".to_string()]);
+        }
+        other => panic!("expected Cycle, got {:?}", other),
+    }
+}
+
+#[test]
+fn detects_three_node_cycle() {
+    let m = manifest_with(vec![
+        morphism("a", vec!["b".into()]),
+        morphism("b", vec!["c".into()]),
+        morphism("c", vec!["a".into()]),
+    ]);
+    match ManifestGraph::build(&m) {
+        Err(GraphError::Cycle(names)) => {
+            assert_eq!(names.len(), 3);
+        }
+        other => panic!("expected Cycle, got {:?}", other),
+    }
+}
+
+#[test]
+fn topological_order_respects_explicit_dependencies() {
+    // a <- b <- c (c depends on b depends on a)
+    let m = manifest_with(vec![
+        morphism("a", vec![]),
+        morphism("b", vec!["a".into()]),
+        morphism("c", vec!["b".into()]),
+    ]);
+    let g = ManifestGraph::build(&m).expect("acyclic");
+    let order = g.topological_order();
+    let pos = |n: &str| order.iter().position(|x| x == n).unwrap();
+    assert!(pos("a") < pos("b"));
+    assert!(pos("b") < pos("c"));
+}
+
+#[test]
+fn unknown_depends_on_target_errors() {
+    let m = manifest_with(vec![morphism("a", vec!["ghost".into()])]);
+    match ManifestGraph::build(&m) {
+        Err(GraphError::UnknownMorphism(name)) => assert_eq!(name, "ghost"),
+        other => panic!("expected UnknownMorphism, got {:?}", other),
+    }
+}
+
+#[test]
+fn treasury_data_flow_indexes_match_manifest() {
+    let exec = Executor::load_module(module("treasury")).expect("load");
+    let g = &exec.graph;
+
+    // Both register_cash_move and transfer_between_cajas write Caja.saldo.
+    let mut writers: Vec<&str> = g.writers_of("Caja.saldo").iter().map(|s| s.as_str()).collect();
+    writers.sort();
+    assert_eq!(writers, vec!["register_cash_move", "transfer_between_cajas"]);
+
+    // Both read Caja.saldo too.
+    let mut readers: Vec<&str> = g.readers_of("Caja.saldo").iter().map(|s| s.as_str()).collect();
+    readers.sort();
+    assert_eq!(readers, vec!["register_cash_move", "transfer_between_cajas"]);
+
+    // Movimiento is written only by register_cash_move.
+    assert_eq!(
+        g.writers_of("Movimiento"),
+        &["register_cash_move".to_string()]
+    );
+
+    // Transferencia is written only by transfer_between_cajas.
+    assert_eq!(
+        g.writers_of("Transferencia"),
+        &["transfer_between_cajas".to_string()]
+    );
+
+    // Nothing in treasury reads Movimiento or Transferencia.
+    assert!(g.readers_of("Movimiento").is_empty());
+    assert!(g.readers_of("Transferencia").is_empty());
+}
+
+#[test]
+fn affected_by_excludes_self_and_finds_overlap() {
+    // A simple two-morphism manifest where one writes what the other reads.
+    let m = manifest_with(vec![
+        MorphismSpec {
+            name: "writer".into(),
+            inputs: vec![MorphismInput {
+                role: "caja".into(),
+                entity: "Caja".into(),
+            }],
+            reads: vec![],
+            writes: vec!["caja.saldo".into()],
+            invariants: Invariants::default(),
+            depends_on: vec![],
+            script: "morphisms/register_cash_move.rhai".into(),
+        },
+        MorphismSpec {
+            name: "reader".into(),
+            inputs: vec![MorphismInput {
+                role: "caja".into(),
+                entity: "Caja".into(),
+            }],
+            reads: vec!["caja.saldo".into()],
+            writes: vec![],
+            invariants: Invariants::default(),
+            depends_on: vec![],
+            script: "morphisms/register_cash_move.rhai".into(),
+        },
+        MorphismSpec {
+            name: "self_loop".into(),
+            inputs: vec![MorphismInput {
+                role: "caja".into(),
+                entity: "Caja".into(),
+            }],
+            reads: vec!["caja.saldo".into()],
+            writes: vec!["caja.saldo".into()],
+            invariants: Invariants::default(),
+            depends_on: vec![],
+            script: "morphisms/register_cash_move.rhai".into(),
+        },
+    ]);
+    let g = ManifestGraph::build(&m).expect("acyclic");
+
+    let mut affected = g.affected_by("writer");
+    affected.sort();
+    // writer writes Caja.saldo; readers are reader + self_loop, but
+    // self_loop is "writer"? no, self_loop is a separate morphism here,
+    // and it does read Caja.saldo so it's affected by writer.
+    assert_eq!(affected, vec!["reader", "self_loop"]);
+
+    // self_loop writes its own field but should not list itself.
+    let affected_self = g.affected_by("self_loop");
+    assert_eq!(affected_self, vec!["reader"]);
+}
+
+#[test]
+fn cross_module_graph_canonicalizes_to_entity_tokens() {
+    // sales/vender uses role "stock" (entity Stock) and role "caja" (entity Caja).
+    // Reads and writes should canonicalize to "Stock.cantidad" and "Caja.saldo".
+    let exec = Executor::load_module(module("sales")).expect("load sales");
+    let g = &exec.graph;
+
+    assert_eq!(g.writers_of("Stock.cantidad"), &["vender".to_string()]);
+    assert_eq!(g.writers_of("Caja.saldo"), &["vender".to_string()]);
+    assert_eq!(g.writers_of("Venta"), &["vender".to_string()]);
+
+    let reads = g.morphism_reads("vender");
+    assert!(reads.contains(&"Stock.cantidad".to_string()));
+    assert!(reads.contains(&"Caja.saldo".to_string()));
+    assert!(reads.contains(&"Caja.currency".to_string()));
+}
+
+#[test]
+fn executor_load_module_rejects_cyclic_manifest() {
+    // Synthesize a tempdir with a cyclic manifest and confirm Executor
+    // surfaces ExecError::Graph rather than running.
+    let tmp = std::env::temp_dir().join(format!("nakui_cycle_{}", uuid::Uuid::new_v4()));
+    std::fs::create_dir_all(tmp.join("morphisms")).unwrap();
+    std::fs::write(
+        tmp.join("schema.k"),
+        "schema Caja:\n    saldo: int\n    check:\n        saldo >= 0\n",
+    )
+    .unwrap();
+    std::fs::write(tmp.join("morphisms/op.rhai"), "[]").unwrap();
+    std::fs::write(
+        tmp.join("nsmc.json"),
+        r#"{
+            "module": "cycle",
+            "morphisms": [
+                {"name": "a", "inputs": [{"role":"caja","entity":"Caja"}],
+                 "reads": [], "writes": ["caja.saldo"], "depends_on": ["b"],
+                 "script": "morphisms/op.rhai"},
+                {"name": "b", "inputs": [{"role":"caja","entity":"Caja"}],
+                 "reads": [], "writes": ["caja.saldo"], "depends_on": ["a"],
+                 "script": "morphisms/op.rhai"}
+            ]
+        }"#,
+    )
+    .unwrap();
+
+    let err = match Executor::load_module(&tmp) {
+        Ok(_) => panic!("must fail with cycle"),
+        Err(e) => e,
+    };
+    let msg = err.to_string();
+    assert!(msg.contains("graph") || msg.contains("cycle"),
+        "expected graph diagnostic, got `{}`", msg);
+
+    let _ = std::fs::remove_dir_all(&tmp);
+}
+
+#[test]
+fn dirty_tracker_marks_after_treasury_morphism() {
+    let exec = Executor::load_module(module("treasury")).expect("load");
+    let mut tracker = DirtyTracker::new();
+
+    // register_cash_move writes Caja.saldo + Movimiento. Both are read by
+    // transfer_between_cajas (Caja.saldo) but Movimiento is read by no one.
+    tracker.mark_dirty_after("register_cash_move", &exec.graph);
+
+    let dirty = tracker.dirty();
+    assert!(
+        dirty.contains(&"transfer_between_cajas".to_string()),
+        "transfer_between_cajas reads Caja.saldo, must be dirty after deposit; got {:?}",
+        dirty
+    );
+    assert!(
+        !tracker.is_dirty("register_cash_move"),
+        "self should not be marked dirty by its own write"
+    );
+}
+
+#[test]
+fn dirty_tracker_clear_works() {
+    let exec = Executor::load_module(module("treasury")).expect("load");
+    let mut tracker = DirtyTracker::new();
+    tracker.mark_dirty_after("transfer_between_cajas", &exec.graph);
+    let count_before = tracker.len();
+    assert!(count_before > 0);
+
+    let first = tracker.dirty().into_iter().next().unwrap();
+    tracker.clear(&first);
+    assert!(!tracker.is_dirty(&first));
+    assert_eq!(tracker.len(), count_before - 1);
+}
+
+#[test]
+fn dirty_tracker_accumulates_across_morphisms() {
+    // Manifest with three morphisms where each writes what the next reads.
+    // After running A then B, both readers should be marked.
+    let m = manifest_with(vec![
+        MorphismSpec {
+            name: "writer_a".into(),
+            inputs: vec![MorphismInput {
+                role: "caja".into(),
+                entity: "Caja".into(),
+            }],
+            reads: vec![],
+            writes: vec!["caja.saldo".into()],
+            invariants: Invariants::default(),
+            depends_on: vec![],
+            script: "morphisms/register_cash_move.rhai".into(),
+        },
+        MorphismSpec {
+            name: "writer_b".into(),
+            inputs: vec![MorphismInput {
+                role: "caja".into(),
+                entity: "Caja".into(),
+            }],
+            reads: vec![],
+            writes: vec!["Movimiento".into()],
+            invariants: Invariants::default(),
+            depends_on: vec![],
+            script: "morphisms/register_cash_move.rhai".into(),
+        },
+        MorphismSpec {
+            name: "reader_caja".into(),
+            inputs: vec![MorphismInput {
+                role: "caja".into(),
+                entity: "Caja".into(),
+            }],
+            reads: vec!["caja.saldo".into()],
+            writes: vec![],
+            invariants: Invariants::default(),
+            depends_on: vec![],
+            script: "morphisms/register_cash_move.rhai".into(),
+        },
+        MorphismSpec {
+            name: "reader_mov".into(),
+            inputs: vec![MorphismInput {
+                role: "caja".into(),
+                entity: "Caja".into(),
+            }],
+            reads: vec!["Movimiento".into()],
+            writes: vec![],
+            invariants: Invariants::default(),
+            depends_on: vec![],
+            script: "morphisms/register_cash_move.rhai".into(),
+        },
+    ]);
+    let g = ManifestGraph::build(&m).unwrap();
+    let mut tracker = DirtyTracker::new();
+
+    tracker.mark_dirty_after("writer_a", &g);
+    assert!(tracker.is_dirty("reader_caja"));
+    assert!(!tracker.is_dirty("reader_mov"));
+
+    tracker.mark_dirty_after("writer_b", &g);
+    assert!(tracker.is_dirty("reader_caja"));
+    assert!(tracker.is_dirty("reader_mov"));
+
+    assert_eq!(tracker.len(), 2);
+}
diff --git a/crates/modules/nakui/core/tests/inventory.rs b/crates/modules/nakui/core/tests/inventory.rs
new file mode 100644
index 0000000..96d4d26
--- /dev/null
+++ b/crates/modules/nakui/core/tests/inventory.rs
@@ -0,0 +1,173 @@
+//! Inventory module integration tests. The point: prove the kernel is
+//! module-agnostic — these tests use the SAME executor code path as
+//! treasury, just pointed at a different module dir, and the conservation
+//! rule is just declarative (Stock.cantidad group_by sku_id).
+
+use std::path::{Path, PathBuf};
+
+use nakui_core::executor::{ExecError, Executor};
+use nakui_core::store::{MemoryStore, Store};
+use serde_json::{Value, json};
+use uuid::Uuid;
+
+fn workspace_root() -> PathBuf {
+    Path::new(env!("CARGO_MANIFEST_DIR"))
+        .parent()
+        .expect("workspace root above core/")
+        .to_path_buf()
+}
+
+fn inventory_module() -> PathBuf {
+    workspace_root().join("modules/inventory")
+}
+
+fn cantidad(store: &MemoryStore, id: Uuid) -> i64 {
+    store
+        .load("Stock", id)
+        .and_then(|v| v.get("cantidad").and_then(Value::as_i64))
+        .expect("stock with cantidad")
+}
+
+fn seed_stock(store: &mut MemoryStore, id: Uuid, sku: &str, cantidad: i64) {
+    store.seed(
+        "Stock",
+        id,
+        json!({
+            "id": id.to_string(),
+            "sku_id": sku,
+            "ubicacion": "test-loc",
+            "cantidad": cantidad,
+        }),
+    );
+}
+
+#[test]
+fn transfer_conserves_units_across_same_sku() {
+    let exec = Executor::load_module(inventory_module()).expect("load module");
+    let mut store = MemoryStore::new();
+
+    let a = Uuid::new_v4();
+    let b = Uuid::new_v4();
+    seed_stock(&mut store, a, "sku-X", 500);
+    seed_stock(&mut store, b, "sku-X", 100);
+
+    let ops = exec
+        .run(
+            &mut store,
+            "transferir_stock",
+            &[("source", a), ("dest", b)],
+            json!({
+                "cantidad": 150_i64,
+                "timestamp": "2026-05-04T00:00:00Z",
+                "transfer_id": Uuid::new_v4().to_string(),
+            }),
+        )
+        .expect("transfer must pass");
+
+    assert_eq!(ops.len(), 3, "2 sets + 1 create = 3 ops");
+    assert_eq!(cantidad(&store, a), 350);
+    assert_eq!(cantidad(&store, b), 250);
+    // Total preserved.
+    assert_eq!(cantidad(&store, a) + cantidad(&store, b), 600);
+}
+
+#[test]
+fn transfer_across_different_skus_is_rejected_by_conservation() {
+    // Construct a buggy synthetic morphism that mimics transfer but skips
+    // the in-script same-sku check. We do this by pointing at a fixture
+    // script that lacks the `throw if source.sku_id != dest.sku_id`.
+    //
+    // Without that fixture we can rely on the production script's `throw`
+    // to fire first — which is itself fine but proves the SCRIPT, not the
+    // KERNEL. To prove the kernel-level conservation works on inventory,
+    // see kernel_guards.rs (treasury) — that test exercises the same
+    // executor logic with Caja.saldo grouped by currency. Here we just
+    // assert the production script rejects cross-SKU.
+    let exec = Executor::load_module(inventory_module()).expect("load module");
+    let mut store = MemoryStore::new();
+
+    let a = Uuid::new_v4();
+    let c = Uuid::new_v4();
+    seed_stock(&mut store, a, "sku-X", 500);
+    seed_stock(&mut store, c, "sku-Y", 200);
+
+    let result = exec.run(
+        &mut store,
+        "transferir_stock",
+        &[("source", a), ("dest", c)],
+        json!({
+            "cantidad": 50_i64,
+            "timestamp": "2026-05-04T00:00:00Z",
+            "transfer_id": Uuid::new_v4().to_string(),
+        }),
+    );
+
+    match result {
+        Err(ExecError::Rhai(_)) => {}
+        other => panic!("expected Rhai (script throw on sku mismatch), got {:?}", other),
+    }
+    assert_eq!(cantidad(&store, a), 500);
+    assert_eq!(cantidad(&store, c), 200);
+}
+
+#[test]
+fn overdraw_transfer_blocked_by_kcl_post_check() {
+    let exec = Executor::load_module(inventory_module()).expect("load module");
+    let mut store = MemoryStore::new();
+
+    let a = Uuid::new_v4();
+    let b = Uuid::new_v4();
+    seed_stock(&mut store, a, "sku-X", 100);
+    seed_stock(&mut store, b, "sku-X", 0);
+
+    let result = exec.run(
+        &mut store,
+        "transferir_stock",
+        &[("source", a), ("dest", b)],
+        json!({
+            "cantidad": 999_i64,
+            "timestamp": "2026-05-04T00:00:00Z",
+            "transfer_id": Uuid::new_v4().to_string(),
+        }),
+    );
+
+    match result {
+        Err(ExecError::KclPost { role, entity, .. }) => {
+            assert_eq!(role, "source");
+            assert_eq!(entity, "Stock");
+        }
+        other => panic!("expected KclPost on source, got {:?}", other),
+    }
+    assert_eq!(cantidad(&store, a), 100);
+    assert_eq!(cantidad(&store, b), 0);
+}
+
+#[test]
+fn recibir_increases_stock_and_creates_movimiento() {
+    let exec = Executor::load_module(inventory_module()).expect("load module");
+    let mut store = MemoryStore::new();
+
+    let a = Uuid::new_v4();
+    seed_stock(&mut store, a, "sku-X", 100);
+
+    let mov_id = Uuid::new_v4();
+    let ops = exec
+        .run(
+            &mut store,
+            "recibir_stock",
+            &[("stock", a)],
+            json!({
+                "cantidad": 50_i64,
+                "timestamp": "2026-05-04T00:00:00Z",
+                "movimiento_id": mov_id.to_string(),
+            }),
+        )
+        .expect("recibir must pass");
+
+    assert_eq!(ops.len(), 2, "1 set + 1 create");
+    assert_eq!(cantidad(&store, a), 150);
+    assert!(
+        store.load("MovimientoStock", mov_id).is_some(),
+        "movimiento must be persisted"
+    );
+}
diff --git a/crates/modules/nakui/core/tests/kernel_guards.rs b/crates/modules/nakui/core/tests/kernel_guards.rs
new file mode 100644
index 0000000..7f4f876
--- /dev/null
+++ b/crates/modules/nakui/core/tests/kernel_guards.rs
@@ -0,0 +1,297 @@
+//! Regression tests for the kernel's enforcement layers.
+//!
+//! Each test runs a deliberately-broken morphism that should be rejected by
+//! a *specific* layer of the executor pipeline. After every rejection we also
+//! assert the store is untouched — the kernel must never half-apply a delta.
+//!
+//! Layers exercised (in pipeline order):
+//!   1. CapabilityViolation  (untracked write)
+//!   2. ConservationViolation (delta sum != 0)
+//!   3. KclPostCreate         (created record fails its schema)
+
+use std::path::{Path, PathBuf};
+
+use nakui_core::executor::{ExecError, Executor};
+use nakui_core::graph::ManifestGraph;
+use nakui_core::manifest::{
+    ConserveRule, Invariants, Manifest, MorphismInput, MorphismSpec,
+};
+use nakui_core::rhai_executor::RhaiExecutor;
+use nakui_core::store::{MemoryStore, Store};
+use serde_json::{Value, json};
+use uuid::Uuid;
+
+fn workspace_root() -> PathBuf {
+    Path::new(env!("CARGO_MANIFEST_DIR"))
+        .parent()
+        .expect("workspace root above core/")
+        .to_path_buf()
+}
+
+fn fixtures_dir() -> PathBuf {
+    Path::new(env!("CARGO_MANIFEST_DIR")).join("tests/fixtures")
+}
+
+fn build_executor(spec: MorphismSpec) -> Executor {
+    let manifest = Manifest {
+        module: "kernel_guards_test".into(),
+        schemas: vec![],
+        morphisms: vec![spec],
+    };
+    let graph = ManifestGraph::build(&manifest).expect("graph builds");
+    Executor {
+        manifest,
+        graph,
+        // module_dir is where script paths resolve; we point it at fixtures.
+        module_dir: fixtures_dir(),
+        // schema_path stays on the real treasury schema so we exercise the
+        // production check blocks. `owned_bundle: false` so Drop leaves it
+        // alone — it belongs to the source tree.
+        schema_path: workspace_root().join("modules/treasury/schema.k"),
+        rhai: RhaiExecutor::new_sandboxed(),
+        owned_bundle: false,
+        // Inline-built executors don't go through `load_module`, so they
+        // have no schema-hash cache. These guard tests don't write to a
+        // log, so verify_log never runs against this executor.
+        schema_hashes: std::collections::HashMap::new(),
+        schema_bundle_hash: [0u8; 32],
+    }
+}
+
+fn seed_caja(store: &mut MemoryStore, id: Uuid, name: &str, saldo: i64, currency: &str) {
+    store.seed(
+        "Caja",
+        id,
+        json!({
+            "id": id.to_string(),
+            "name": name,
+            "saldo": saldo,
+            "currency": currency,
+        }),
+    );
+}
+
+fn caja_saldo(store: &MemoryStore, id: Uuid) -> i64 {
+    store
+        .load("Caja", id)
+        .and_then(|v| v.get("saldo").and_then(Value::as_i64))
+        .expect("caja with saldo")
+}
+
+#[test]
+fn capability_violation_blocks_write_to_untracked_caja() {
+    let spec = MorphismSpec {
+        name: "evil_capability".into(),
+        inputs: vec![MorphismInput {
+            role: "caja".into(),
+            entity: "Caja".into(),
+        }],
+        reads: vec!["caja.saldo".into()],
+        writes: vec!["caja.saldo".into()],
+        invariants: Invariants::default(),
+        depends_on: vec![],
+        script: "capability_violation.rhai".into(),
+    };
+    let exec = build_executor(spec);
+
+    let mut store = MemoryStore::new();
+    let caja_id = Uuid::new_v4();
+    let phantom_id = Uuid::new_v4();
+    seed_caja(&mut store, caja_id, "tracked", 100_000, "USD");
+    seed_caja(&mut store, phantom_id, "phantom", 100_000, "USD");
+
+    let params = json!({ "phantom_id": phantom_id.to_string() });
+
+    let result = exec.run(&mut store, "evil_capability", &[("caja", caja_id)], params);
+
+    match result {
+        Err(ExecError::CapabilityViolation { token, .. }) => {
+            assert!(
+                token.contains("untracked"),
+                "expected token to flag untracked id, got `{}`",
+                token
+            );
+        }
+        other => panic!("expected CapabilityViolation, got {:?}", other),
+    }
+
+    // Neither caja moved.
+    assert_eq!(caja_saldo(&store, caja_id), 100_000);
+    assert_eq!(caja_saldo(&store, phantom_id), 100_000);
+}
+
+#[test]
+fn conservation_violation_blocks_unbalanced_transfer() {
+    let spec = MorphismSpec {
+        name: "evil_conservation".into(),
+        inputs: vec![
+            MorphismInput {
+                role: "source".into(),
+                entity: "Caja".into(),
+            },
+            MorphismInput {
+                role: "dest".into(),
+                entity: "Caja".into(),
+            },
+        ],
+        reads: vec![
+            "source.saldo".into(),
+            "source.currency".into(),
+            "dest.saldo".into(),
+            "dest.currency".into(),
+        ],
+        writes: vec!["source.saldo".into(), "dest.saldo".into()],
+        invariants: Invariants {
+            conserve: vec![ConserveRule {
+                entity: "Caja".into(),
+                field: "saldo".into(),
+                group_by: Some("currency".into()),
+            }],
+        },
+        depends_on: vec![],
+        script: "conservation_violation.rhai".into(),
+    };
+    let exec = build_executor(spec);
+
+    let mut store = MemoryStore::new();
+    let source = Uuid::new_v4();
+    let dest = Uuid::new_v4();
+    seed_caja(&mut store, source, "A", 200_000, "USD");
+    seed_caja(&mut store, dest, "B", 50_000, "USD");
+
+    let result = exec.run(
+        &mut store,
+        "evil_conservation",
+        &[("source", source), ("dest", dest)],
+        json!({}),
+    );
+
+    match result {
+        Err(ExecError::ConservationViolation {
+            entity,
+            field,
+            total,
+            ..
+        }) => {
+            assert_eq!(entity, "Caja");
+            assert_eq!(field, "saldo");
+            assert_eq!(total, -101, "expected Δ = -100 + -1 = -101");
+        }
+        other => panic!("expected ConservationViolation, got {:?}", other),
+    }
+
+    assert_eq!(caja_saldo(&store, source), 200_000);
+    assert_eq!(caja_saldo(&store, dest), 50_000);
+}
+
+#[test]
+fn capability_rejects_entity_mismatch_on_tracked_id() {
+    // The script writes `Stock.cantidad` using the Caja's UUID. The id is
+    // tracked (it's the caja role's id) but the entity differs — the
+    // capability layer must catch this regardless of UUID coincidence.
+    let spec = MorphismSpec {
+        name: "evil_entity_mismatch".into(),
+        inputs: vec![MorphismInput {
+            role: "caja".into(),
+            entity: "Caja".into(),
+        }],
+        reads: vec!["caja.saldo".into()],
+        writes: vec!["caja.saldo".into()],
+        invariants: Invariants::default(),
+        depends_on: vec![],
+        script: "entity_mismatch.rhai".into(),
+    };
+    let exec = build_executor(spec);
+
+    let mut store = MemoryStore::new();
+    let caja_id = Uuid::new_v4();
+    seed_caja(&mut store, caja_id, "tracked", 100_000, "USD");
+
+    let result = exec.run(&mut store, "evil_entity_mismatch", &[("caja", caja_id)], json!({}));
+
+    match result {
+        Err(ExecError::CapabilityViolation { token, .. }) => {
+            assert!(
+                token.contains("entity-mismatch"),
+                "expected entity-mismatch token, got `{}`",
+                token
+            );
+        }
+        other => panic!("expected CapabilityViolation, got {:?}", other),
+    }
+    assert_eq!(caja_saldo(&store, caja_id), 100_000);
+}
+
+#[test]
+fn delete_primary_skips_post_check_and_removes_record() {
+    // A morphism that deletes its primary input must succeed without the
+    // post-check running against a stale-then-stripped state.
+    let spec = MorphismSpec {
+        name: "delete_caja".into(),
+        inputs: vec![MorphismInput {
+            role: "caja".into(),
+            entity: "Caja".into(),
+        }],
+        reads: vec![],
+        writes: vec!["Caja".into()],
+        invariants: Invariants::default(),
+        depends_on: vec![],
+        script: "delete_primary.rhai".into(),
+    };
+    let exec = build_executor(spec);
+
+    let mut store = MemoryStore::new();
+    let caja_id = Uuid::new_v4();
+    seed_caja(&mut store, caja_id, "doomed", 100_000, "USD");
+
+    let ops = exec
+        .run(&mut store, "delete_caja", &[("caja", caja_id)], json!({}))
+        .expect("delete must succeed");
+
+    assert_eq!(ops.len(), 1);
+    assert!(matches!(&ops[0], nakui_core::delta::FieldOp::Delete { .. }));
+    assert!(
+        store.load("Caja", caja_id).is_none(),
+        "Caja must be gone after Delete"
+    );
+}
+
+#[test]
+fn bad_created_record_blocks_negative_movimiento() {
+    let spec = MorphismSpec {
+        name: "evil_create".into(),
+        inputs: vec![MorphismInput {
+            role: "caja".into(),
+            entity: "Caja".into(),
+        }],
+        reads: vec!["caja.saldo".into()],
+        writes: vec!["Movimiento".into()],
+        invariants: Invariants::default(),
+        depends_on: vec![],
+        script: "bad_created_record.rhai".into(),
+    };
+    let exec = build_executor(spec);
+
+    let mut store = MemoryStore::new();
+    let caja_id = Uuid::new_v4();
+    seed_caja(&mut store, caja_id, "A", 100_000, "USD");
+    let mov_id = Uuid::new_v4();
+
+    let params = json!({ "mov_id": mov_id.to_string() });
+
+    let result = exec.run(&mut store, "evil_create", &[("caja", caja_id)], params);
+
+    match result {
+        Err(ExecError::KclPostCreate { entity, .. }) => {
+            assert_eq!(entity, "Movimiento");
+        }
+        other => panic!("expected KclPostCreate, got {:?}", other),
+    }
+
+    // Caja unchanged, Movimiento never landed.
+    assert_eq!(caja_saldo(&store, caja_id), 100_000);
+    assert!(
+        store.load("Movimiento", mov_id).is_none(),
+        "Movimiento must not be persisted"
+    );
+}
diff --git a/crates/modules/nakui/core/tests/manifest_validation.rs b/crates/modules/nakui/core/tests/manifest_validation.rs
new file mode 100644
index 0000000..2b4b1bd
--- /dev/null
+++ b/crates/modules/nakui/core/tests/manifest_validation.rs
@@ -0,0 +1,282 @@
+//! Manifest::validate covers the contract between authors (humans or AI)
+//! and Nakui. Each test inline-builds a manifest with one specific defect
+//! and asserts the right diagnostic fires.
+//!
+//! Most tests point at `modules/treasury/` so the schema/script paths
+//! resolve. Two tests need a synthetic tempdir to express their defect
+//! (missing schema file, duplicate schema across files).
+
+use std::fs;
+use std::path::{Path, PathBuf};
+
+use nakui_core::executor::Executor;
+use nakui_core::manifest::{
+    ConserveRule, Invariants, Manifest, MorphismInput, MorphismSpec, ValidationError,
+};
+use uuid::Uuid;
+
+fn workspace_root() -> PathBuf {
+    Path::new(env!("CARGO_MANIFEST_DIR"))
+        .parent()
+        .expect("workspace root above core/")
+        .to_path_buf()
+}
+
+fn treasury_dir() -> PathBuf {
+    workspace_root().join("modules/treasury")
+}
+
+fn caja_input() -> MorphismInput {
+    MorphismInput {
+        role: "caja".into(),
+        entity: "Caja".into(),
+    }
+}
+
+fn baseline_morphism() -> MorphismSpec {
+    MorphismSpec {
+        name: "test_op".into(),
+        inputs: vec![caja_input()],
+        reads: vec!["caja.saldo".into()],
+        writes: vec!["caja.saldo".into()],
+        invariants: Invariants::default(),
+        depends_on: vec![],
+        script: "morphisms/register_cash_move.rhai".into(),
+    }
+}
+
+fn baseline_manifest() -> Manifest {
+    Manifest {
+        module: "test".into(),
+        schemas: vec![],
+        morphisms: vec![baseline_morphism()],
+    }
+}
+
+#[test]
+fn production_modules_validate_clean() {
+    for name in ["treasury", "inventory", "sales"] {
+        let dir = workspace_root().join("modules").join(name);
+        let manifest = Manifest::load(&dir.join("nsmc.json"))
+            .unwrap_or_else(|e| panic!("load {}: {}", name, e));
+        manifest
+            .validate(&dir)
+            .unwrap_or_else(|e| panic!("validate {}: {}", name, e));
+    }
+}
+
+#[test]
+fn rejects_duplicate_morphism_name() {
+    let mut m = baseline_manifest();
+    m.morphisms.push(baseline_morphism()); // same name as the first
+    match m.validate(&treasury_dir()) {
+        Err(ValidationError::DuplicateMorphism(name)) => assert_eq!(name, "test_op"),
+        other => panic!("expected DuplicateMorphism, got {:?}", other),
+    }
+}
+
+#[test]
+fn rejects_duplicate_role_within_morphism() {
+    let mut m = baseline_manifest();
+    m.morphisms[0].inputs.push(caja_input()); // same role twice
+    match m.validate(&treasury_dir()) {
+        Err(ValidationError::DuplicateRole { morphism, role }) => {
+            assert_eq!(morphism, "test_op");
+            assert_eq!(role, "caja");
+        }
+        other => panic!("expected DuplicateRole, got {:?}", other),
+    }
+}
+
+#[test]
+fn rejects_input_unknown_entity() {
+    let mut m = baseline_manifest();
+    m.morphisms[0].inputs[0].entity = "Banana".into();
+    match m.validate(&treasury_dir()) {
+        Err(ValidationError::InputUnknownEntity {
+            morphism,
+            entity,
+            known,
+        }) => {
+            assert_eq!(morphism, "test_op");
+            assert_eq!(entity, "Banana");
+            assert!(known.contains(&"Caja".to_string()));
+        }
+        other => panic!("expected InputUnknownEntity, got {:?}", other),
+    }
+}
+
+#[test]
+fn rejects_writes_unknown_role() {
+    let mut m = baseline_manifest();
+    m.morphisms[0].writes = vec!["ghost.saldo".into()];
+    match m.validate(&treasury_dir()) {
+        Err(ValidationError::WritesUnknownRole {
+            morphism,
+            token,
+            role,
+            ..
+        }) => {
+            assert_eq!(morphism, "test_op");
+            assert_eq!(token, "ghost.saldo");
+            assert_eq!(role, "ghost");
+        }
+        other => panic!("expected WritesUnknownRole, got {:?}", other),
+    }
+}
+
+#[test]
+fn rejects_writes_unknown_entity() {
+    let mut m = baseline_manifest();
+    m.morphisms[0].writes = vec!["BananaSplit".into()];
+    match m.validate(&treasury_dir()) {
+        Err(ValidationError::WritesUnknownEntity { morphism, token }) => {
+            assert_eq!(morphism, "test_op");
+            assert_eq!(token, "BananaSplit");
+        }
+        other => panic!("expected WritesUnknownEntity, got {:?}", other),
+    }
+}
+
+#[test]
+fn rejects_conserve_unknown_entity() {
+    let mut m = baseline_manifest();
+    m.morphisms[0].invariants.conserve = vec![ConserveRule {
+        entity: "Banana".into(),
+        field: "x".into(),
+        group_by: None,
+    }];
+    match m.validate(&treasury_dir()) {
+        Err(ValidationError::ConserveUnknownEntity { morphism, entity }) => {
+            assert_eq!(morphism, "test_op");
+            assert_eq!(entity, "Banana");
+        }
+        other => panic!("expected ConserveUnknownEntity, got {:?}", other),
+    }
+}
+
+#[test]
+fn rejects_depends_on_unknown_morphism() {
+    let mut m = baseline_manifest();
+    m.morphisms[0].depends_on = vec!["ghost_morphism".into()];
+    match m.validate(&treasury_dir()) {
+        Err(ValidationError::DependsOnUnknown { morphism, dep }) => {
+            assert_eq!(morphism, "test_op");
+            assert_eq!(dep, "ghost_morphism");
+        }
+        other => panic!("expected DependsOnUnknown, got {:?}", other),
+    }
+}
+
+#[test]
+fn rejects_missing_script() {
+    let mut m = baseline_manifest();
+    m.morphisms[0].script = "morphisms/ghost.rhai".into();
+    match m.validate(&treasury_dir()) {
+        Err(ValidationError::ScriptMissing { morphism, script, .. }) => {
+            assert_eq!(morphism, "test_op");
+            assert_eq!(script, "morphisms/ghost.rhai");
+        }
+        other => panic!("expected ScriptMissing, got {:?}", other),
+    }
+}
+
+#[test]
+fn rejects_missing_schema_file() {
+    let mut m = baseline_manifest();
+    m.schemas = vec!["nonexistent.k".into()];
+    match m.validate(&treasury_dir()) {
+        Err(ValidationError::SchemaFileMissing { path, .. }) => {
+            assert_eq!(path, "nonexistent.k");
+        }
+        other => panic!("expected SchemaFileMissing, got {:?}", other),
+    }
+}
+
+#[test]
+fn rejects_duplicate_schema_across_files() {
+    // Synthesize a tempdir with two .k files that both declare `schema X`.
+    let tmp = std::env::temp_dir().join(format!("nakui_dup_{}", Uuid::new_v4()));
+    fs::create_dir_all(&tmp).unwrap();
+    fs::create_dir_all(tmp.join("morphisms")).unwrap();
+    fs::write(
+        tmp.join("a.k"),
+        "schema Caja:\n    saldo: int\n    check:\n        saldo >= 0\n",
+    )
+    .unwrap();
+    fs::write(
+        tmp.join("b.k"),
+        "schema Caja:\n    monto: int\n    check:\n        monto >= 0\n",
+    )
+    .unwrap();
+    fs::write(tmp.join("morphisms/op.rhai"), "[]").unwrap();
+
+    let m = Manifest {
+        module: "dup".into(),
+        schemas: vec!["a.k".into(), "b.k".into()],
+        morphisms: vec![MorphismSpec {
+            name: "op".into(),
+            inputs: vec![MorphismInput {
+                role: "caja".into(),
+                entity: "Caja".into(),
+            }],
+            reads: vec![],
+            writes: vec![],
+            invariants: Invariants::default(),
+            depends_on: vec![],
+            script: "morphisms/op.rhai".into(),
+        }],
+    };
+
+    match m.validate(&tmp) {
+        Err(ValidationError::DuplicateSchema { name, files }) => {
+            assert_eq!(name, "Caja");
+            assert!(files.contains(&"a.k".to_string()));
+            assert!(files.contains(&"b.k".to_string()));
+        }
+        other => panic!("expected DuplicateSchema, got {:?}", other),
+    }
+
+    let _ = fs::remove_dir_all(&tmp);
+}
+
+#[test]
+fn executor_load_module_runs_validation() {
+    // Synthesize a module dir whose manifest references a missing script —
+    // load_module must surface ManifestValidation, not a runtime kernel error.
+    let tmp = std::env::temp_dir().join(format!("nakui_bad_{}", Uuid::new_v4()));
+    fs::create_dir_all(&tmp).unwrap();
+    fs::write(
+        tmp.join("schema.k"),
+        "schema Caja:\n    saldo: int\n    check:\n        saldo >= 0\n",
+    )
+    .unwrap();
+    fs::write(
+        tmp.join("nsmc.json"),
+        r#"{
+            "module": "bad",
+            "morphisms": [{
+                "name": "op",
+                "inputs": [{"role": "caja", "entity": "Caja"}],
+                "reads": [],
+                "writes": ["caja.saldo"],
+                "depends_on": [],
+                "script": "morphisms/missing.rhai"
+            }]
+        }"#,
+    )
+    .unwrap();
+
+    let err = match Executor::load_module(&tmp) {
+        Ok(_) => panic!("must fail validation"),
+        Err(e) => e,
+    };
+    let msg = err.to_string();
+    assert!(
+        msg.contains("validation") && msg.contains("missing.rhai"),
+        "expected validation diagnostic naming the missing script, got `{}`",
+        msg
+    );
+
+    let _ = fs::remove_dir_all(&tmp);
+}
diff --git a/crates/modules/nakui/core/tests/run.rs b/crates/modules/nakui/core/tests/run.rs
new file mode 100644
index 0000000..94f7e8b
--- /dev/null
+++ b/crates/modules/nakui/core/tests/run.rs
@@ -0,0 +1,286 @@
+//! End-to-end tests for `nakui run` — bind a socket from the main test
+//! thread, drive it from a client thread with line-JSON requests, and
+//! assert behaviour through the wire.
+//!
+//! Why server-on-main / client-on-thread: `Executor` is `!Send` (Rhai
+//! caches AST in a `RefCell`). Moving it across thread boundaries is a
+//! compile-time error, so the test thread runs the server and a worker
+//! thread plays the client. The worker calls `shutdown` last, which lets
+//! the main thread return from `run_server` and join.
+
+use std::io::{BufRead, BufReader, Write};
+use std::os::unix::net::UnixStream;
+use std::path::{Path, PathBuf};
+use std::thread;
+use std::time::Duration;
+
+use nakui_core::event_log::{EventLog, execute_and_log, seed_and_log};
+use nakui_core::executor::Executor;
+use nakui_core::run::run_server;
+use nakui_core::store::MemoryStore;
+use serde_json::{Value, json};
+use uuid::Uuid;
+
+fn workspace_root() -> PathBuf {
+    Path::new(env!("CARGO_MANIFEST_DIR"))
+        .parent()
+        .expect("workspace root above core/")
+        .to_path_buf()
+}
+
+fn treasury_module() -> PathBuf {
+    workspace_root().join("modules/treasury")
+}
+
+fn fresh_log_path() -> PathBuf {
+    std::env::temp_dir().join(format!("nakui_run_log_{}.jsonl", Uuid::new_v4()))
+}
+
+fn fresh_socket_path() -> PathBuf {
+    std::env::temp_dir().join(format!("nakui_run_{}.sock", Uuid::new_v4()))
+}
+
+/// One client connection: keeps a single BufReader alive across
+/// exchanges so buffered bytes from one response don't get dropped
+/// before the next read.
+struct Conn {
+    writer: UnixStream,
+    reader: BufReader<UnixStream>,
+}
+
+impl Conn {
+    fn connect_with_retry(path: &Path) -> Self {
+        for _ in 0..100 {
+            if let Ok(stream) = UnixStream::connect(path) {
+                let reader_stream = stream.try_clone().expect("clone for reader");
+                return Self {
+                    writer: stream,
+                    reader: BufReader::new(reader_stream),
+                };
+            }
+            thread::sleep(Duration::from_millis(20));
+        }
+        panic!("server never started accepting on {}", path.display());
+    }
+
+    fn exchange(&mut self, req: Value) -> Value {
+        let mut s = serde_json::to_vec(&req).expect("serialize request");
+        s.push(b'\n');
+        self.writer.write_all(&s).expect("write request");
+        let mut line = String::new();
+        let n = self.reader.read_line(&mut line).expect("read response");
+        assert!(n > 0, "server closed connection without responding");
+        serde_json::from_str(line.trim()).expect("parse response")
+    }
+}
+
+#[test]
+fn run_server_full_protocol_round_trip() {
+    let log_path = fresh_log_path();
+    let socket_path = fresh_socket_path();
+
+    let caja_id = Uuid::new_v4();
+    {
+        let executor = Executor::load_module(treasury_module()).expect("load module");
+        let mut log = EventLog::open(&log_path).expect("open log");
+        let mut store = MemoryStore::new();
+        seed_and_log(
+            &executor,
+            &mut store,
+            &mut log,
+            "Caja",
+            caja_id,
+            json!({
+                "id": caja_id.to_string(),
+                "name": "A",
+                "saldo": 100_000_i64,
+                "currency": "USD",
+            }),
+        )
+        .expect("seed");
+    }
+
+    let executor = Executor::load_module(treasury_module()).expect("load module");
+    let log = EventLog::open(&log_path).expect("reopen log");
+    let store = MemoryStore::new();
+
+    let socket_for_client = socket_path.clone();
+    let client = thread::spawn(move || -> Result<(), String> {
+        let mut conn = Conn::connect_with_retry(&socket_for_client);
+
+        let resp = conn.exchange(json!({"op": "describe"}));
+        if resp["ok"] != json!(true) {
+            return Err(format!("describe not ok: {}", resp));
+        }
+        if resp["module"] != json!("treasury") {
+            return Err(format!("module mismatch: {}", resp));
+        }
+        if resp["protocol"] != json!(1) {
+            return Err(format!("protocol mismatch: {}", resp));
+        }
+        let morphisms = resp["morphisms"]
+            .as_array()
+            .ok_or("morphisms not array")?;
+        if !morphisms.iter().any(|m| m["name"] == "register_cash_move") {
+            return Err("register_cash_move missing from describe".into());
+        }
+
+        let resp = conn.exchange(json!({
+            "op": "load",
+            "entity": "Caja",
+            "id": caja_id.to_string(),
+        }));
+        if resp["value"]["saldo"].as_i64() != Some(100_000) {
+            return Err(format!("initial saldo wrong: {}", resp));
+        }
+
+        let resp = conn.exchange(json!({
+            "op": "execute",
+            "morphism": "register_cash_move",
+            "inputs": {"caja": caja_id.to_string()},
+            "params": {
+                "monto": 5_000_i64,
+                "tipo": "in",
+                "timestamp": "2026-05-04T10:00:00Z",
+                "memo": "via run",
+                "movimiento_id": Uuid::new_v4().to_string(),
+            },
+        }));
+        if resp["ok"] != json!(true) {
+            return Err(format!("execute failed: {}", resp));
+        }
+        if resp["seq"].as_u64().is_none() {
+            return Err(format!("execute missing seq: {}", resp));
+        }
+        if resp["ops"].as_array().map(|a| a.is_empty()).unwrap_or(true) {
+            return Err(format!("execute missing ops: {}", resp));
+        }
+
+        let resp = conn.exchange(json!({
+            "op": "load",
+            "entity": "Caja",
+            "id": caja_id.to_string(),
+        }));
+        if resp["value"]["saldo"].as_i64() != Some(105_000) {
+            return Err(format!("post-execute saldo wrong: {}", resp));
+        }
+
+        // Kernel rejection: returns ok=false with stage=pre_log.
+        let other = Uuid::new_v4();
+        let resp = conn.exchange(json!({
+            "op": "execute",
+            "morphism": "transfer_between_cajas",
+            "inputs": {"source": caja_id.to_string(), "dest": other.to_string()},
+            "params": {
+                "monto": 999_999_999_i64,
+                "timestamp": "2026-05-04T10:30:00Z",
+                "memo": "overdraw",
+                "transfer_id": Uuid::new_v4().to_string(),
+            },
+        }));
+        if resp["ok"] != json!(false) || resp["stage"] != json!("pre_log") {
+            return Err(format!("expected pre_log rejection: {}", resp));
+        }
+
+        // Bad JSON — connection survives, server keeps serving.
+        conn.writer.write_all(b"not json\n").map_err(|e| e.to_string())?;
+        let mut line = String::new();
+        conn.reader.read_line(&mut line).map_err(|e| e.to_string())?;
+        let parsed: Value = serde_json::from_str(line.trim()).map_err(|e| e.to_string())?;
+        if parsed["ok"] != json!(false) {
+            return Err(format!("bad request didn't get error: {}", parsed));
+        }
+
+        let resp = conn.exchange(json!({"op": "verify"}));
+        if resp["ok"] != json!(true) {
+            return Err(format!("verify failed: {}", resp));
+        }
+        if resp["entries"].as_u64() != Some(2) {
+            return Err(format!("verify entries wrong: {}", resp));
+        }
+
+        let resp = conn.exchange(json!({"op": "shutdown"}));
+        if resp["ok"] != json!(true) || resp["shutdown"] != json!(true) {
+            return Err(format!("shutdown response wrong: {}", resp));
+        }
+        Ok(())
+    });
+
+    run_server(executor, log, store, None, &socket_path).expect("server clean exit");
+    client.join().expect("client thread joined").expect("client assertions");
+
+    assert!(
+        !socket_path.exists(),
+        "shutdown must remove the socket file"
+    );
+    let _ = std::fs::remove_file(&log_path);
+}
+
+#[test]
+fn run_server_reconciles_drifted_store_on_startup() {
+    let log_path = fresh_log_path();
+    let socket_path = fresh_socket_path();
+
+    let caja_id = Uuid::new_v4();
+    {
+        let executor = Executor::load_module(treasury_module()).expect("load");
+        let mut log = EventLog::open(&log_path).expect("open log");
+        let mut store = MemoryStore::new();
+        seed_and_log(
+            &executor,
+            &mut store,
+            &mut log,
+            "Caja",
+            caja_id,
+            json!({
+                "id": caja_id.to_string(),
+                "name": "A",
+                "saldo": 200_000_i64,
+                "currency": "USD",
+            }),
+        )
+        .expect("seed");
+        execute_and_log(
+            &executor,
+            &mut store,
+            &mut log,
+            "register_cash_move",
+            &[("caja", caja_id)],
+            json!({
+                "monto": 1_500_i64,
+                "tipo": "in",
+                "timestamp": "2026-05-04T09:00:00Z",
+                "memo": "pre-run",
+                "movimiento_id": Uuid::new_v4().to_string(),
+            }),
+        )
+        .expect("deposit");
+    }
+
+    let executor = Executor::load_module(treasury_module()).expect("load");
+    let log = EventLog::open(&log_path).expect("reopen");
+    let empty_store = MemoryStore::new();
+
+    let socket_for_client = socket_path.clone();
+    let client = thread::spawn(move || -> Result<(), String> {
+        let mut conn = Conn::connect_with_retry(&socket_for_client);
+        let resp = conn.exchange(json!({
+            "op": "load",
+            "entity": "Caja",
+            "id": caja_id.to_string(),
+        }));
+        if resp["value"]["saldo"].as_i64() != Some(201_500) {
+            return Err(format!(
+                "expected saldo 201_500 (200k seed + 1.5k replayed deposit), got {}",
+                resp
+            ));
+        }
+        conn.exchange(json!({"op": "shutdown"}));
+        Ok(())
+    });
+
+    run_server(executor, log, empty_store, None, &socket_path).expect("clean exit");
+    client.join().unwrap().expect("client assertions");
+
+    let _ = std::fs::remove_file(&log_path);
+}
diff --git a/crates/modules/nakui/core/tests/run_persistent.rs b/crates/modules/nakui/core/tests/run_persistent.rs
new file mode 100644
index 0000000..63bcfa5
--- /dev/null
+++ b/crates/modules/nakui/core/tests/run_persistent.rs
@@ -0,0 +1,328 @@
+//! Smoke test for the persistent backend wired into `nakui run`.
+//!
+//! Gated behind `--features persistent` because SurrealKV pulls in a
+//! ~5 min cold native build. Run with:
+//!     cargo test --features persistent --test run_persistent
+//!
+//! What this proves:
+//!   1. `run_server` accepts a `SurrealStore` and serves the standard
+//!      protocol (execute/load/shutdown round-trip).
+//!   2. After shutdown, reopening the same backing store path reveals
+//!      the records were actually written through to disk — i.e., the
+//!      runtime wasn't just hitting an in-memory façade.
+//!
+//! What this does NOT prove (covered elsewhere or deferred):
+//!   - That startup skips replay when the persistent state is current.
+//!     V1 always replays from log, even with a persistent store; the
+//!     persistent layer is durability for the runtime cache, not a
+//!     replay shortcut. A future `last_applied_seq` tracker would
+//!     change that.
+//!   - Cross-backend hash equality (Memory vs Surreal). Different
+//!     concern — round-trip parity of serde_json::Value through the
+//!     SurrealDB driver.
+
+#![cfg(feature = "persistent")]
+
+use std::io::{BufRead, BufReader, Write};
+use std::os::unix::net::UnixStream;
+use std::path::{Path, PathBuf};
+use std::thread;
+use std::time::Duration;
+
+use nakui_core::event_log::{EventLog, seed_and_log};
+use nakui_core::executor::Executor;
+use nakui_core::run::run_server;
+use nakui_core::store::Store;
+use nakui_core::surreal_store::SurrealStore;
+use serde_json::{Value, json};
+use uuid::Uuid;
+
+fn workspace_root() -> PathBuf {
+    Path::new(env!("CARGO_MANIFEST_DIR"))
+        .parent()
+        .expect("workspace root above core/")
+        .to_path_buf()
+}
+
+fn treasury_module() -> PathBuf {
+    workspace_root().join("modules/treasury")
+}
+
+fn fresh_log_path() -> PathBuf {
+    std::env::temp_dir().join(format!("nakui_runp_log_{}.jsonl", Uuid::new_v4()))
+}
+
+fn fresh_store_path() -> PathBuf {
+    std::env::temp_dir().join(format!("nakui_runp_store_{}", Uuid::new_v4()))
+}
+
+fn fresh_socket_path() -> PathBuf {
+    std::env::temp_dir().join(format!("nakui_runp_{}.sock", Uuid::new_v4()))
+}
+
+struct Conn {
+    writer: UnixStream,
+    reader: BufReader<UnixStream>,
+}
+
+fn connect_with_retry(path: &Path) -> Conn {
+    for _ in 0..200 {
+        if let Ok(stream) = UnixStream::connect(path) {
+            let reader_stream = stream.try_clone().expect("clone");
+            return Conn {
+                writer: stream,
+                reader: BufReader::new(reader_stream),
+            };
+        }
+        thread::sleep(Duration::from_millis(20));
+    }
+    panic!("server never started accepting on {}", path.display());
+}
+
+fn exchange(conn: &mut Conn, req: Value) -> Value {
+    let mut bytes = serde_json::to_vec(&req).unwrap();
+    bytes.push(b'\n');
+    conn.writer.write_all(&bytes).unwrap();
+    let mut line = String::new();
+    conn.reader.read_line(&mut line).unwrap();
+    serde_json::from_str(line.trim()).unwrap()
+}
+
+#[test]
+fn run_server_with_persistent_surreal_serves_protocol_and_writes_to_disk() {
+    let log_path = fresh_log_path();
+    let store_path = fresh_store_path();
+    let socket_path = fresh_socket_path();
+
+    // Pre-seed via the WAL so the log has a record the server can
+    // replay into the persistent store on startup.
+    let caja = Uuid::new_v4();
+    {
+        let mut store = SurrealStore::new_persistent(&store_path).expect("open persistent");
+        let mut log = EventLog::open(&log_path).expect("open log");
+        seed_and_log(
+            &executor,
+            &mut store,
+            &mut log,
+            "Caja",
+            caja,
+            json!({
+                "id": caja.to_string(),
+                "name": "A",
+                "saldo": 100_000_i64,
+                "currency": "USD",
+            }),
+        )
+        .expect("seed");
+    }
+
+    // Start the server with the same persistent store path.
+    let executor = Executor::load_module(treasury_module()).expect("load module");
+    let log = EventLog::open(&log_path).expect("reopen log");
+    let store = SurrealStore::new_persistent(&store_path).expect("reopen persistent");
+
+    let socket_for_client = socket_path.clone();
+    let client = thread::spawn(move || -> Result<(), String> {
+        let mut conn = connect_with_retry(&socket_for_client);
+
+        // Initial load picks up the seed (replayed at startup into the
+        // persistent store).
+        let resp = exchange(
+            &mut conn,
+            json!({"op": "load", "entity": "Caja", "id": caja.to_string()}),
+        );
+        if resp["value"]["saldo"].as_i64() != Some(100_000) {
+            return Err(format!("startup replay didn't land seed: {}", resp));
+        }
+
+        // Drive a deposit through the server — this writes through the
+        // log AND the persistent store.
+        let resp = exchange(
+            &mut conn,
+            json!({
+                "op": "execute",
+                "morphism": "register_cash_move",
+                "inputs": {"caja": caja.to_string()},
+                "params": {
+                    "monto": 7_500_i64,
+                    "tipo": "in",
+                    "timestamp": "2026-05-04T10:00:00Z",
+                    "memo": "persisted",
+                    "movimiento_id": Uuid::new_v4().to_string(),
+                }
+            }),
+        );
+        if resp["ok"] != json!(true) {
+            return Err(format!("execute failed: {}", resp));
+        }
+
+        let resp = exchange(
+            &mut conn,
+            json!({"op": "load", "entity": "Caja", "id": caja.to_string()}),
+        );
+        if resp["value"]["saldo"].as_i64() != Some(107_500) {
+            return Err(format!("post-execute saldo wrong: {}", resp));
+        }
+
+        let _ = exchange(&mut conn, json!({"op": "shutdown"}));
+        Ok(())
+    });
+
+    run_server(executor, log, store, None, &socket_path).expect("server clean exit");
+    client.join().unwrap().expect("client assertions");
+
+    // Now the server is gone. Open a fresh handle to the SAME persistent
+    // store path — the records must be there without any replay. This
+    // is what proves "persistent backend" beyond the unit-level tests
+    // in surreal_persist.rs: the runtime actually wrote through.
+    let store_again = SurrealStore::new_persistent(&store_path).expect("reopen final");
+    let v = store_again
+        .load("Caja", caja)
+        .expect("Caja persisted across server shutdown");
+    assert_eq!(
+        v.get("saldo").and_then(Value::as_i64),
+        Some(107_500),
+        "deposit landed in persistent store"
+    );
+
+    let _ = std::fs::remove_file(&log_path);
+    let _ = std::fs::remove_dir_all(&store_path);
+}
+
+#[test]
+fn run_server_skips_replay_when_persistent_store_is_in_sync() {
+    // The optimization: when the persistent store's `last_applied_seq`
+    // matches the log's last seq, startup_replay must skip the
+    // clear+replay entirely. We prove that by mutating the store
+    // out-of-band between cycles — if skip happens, the mutation
+    // survives; if full replay runs (clear+replay), it'd be wiped.
+    let log_path = fresh_log_path();
+    let store_path = fresh_store_path();
+    let socket_path1 = fresh_socket_path();
+    let socket_path2 = fresh_socket_path();
+    let caja = Uuid::new_v4();
+
+    // Cycle 1: drive a deposit through the server. After shutdown the
+    // persistent store's marker should equal the log's last seq.
+    {
+        let executor = Executor::load_module(treasury_module()).expect("load");
+        let mut log = EventLog::open(&log_path).expect("open log");
+        let mut store = SurrealStore::new_persistent(&store_path).expect("open persistent");
+        seed_and_log(
+            &executor,
+            &mut store,
+            &mut log,
+            "Caja",
+            caja,
+            json!({
+                "id": caja.to_string(),
+                "name": "A",
+                "saldo": 100_000_i64,
+                "currency": "USD",
+            }),
+        )
+        .expect("seed");
+        // We end the WAL flow without running run_server in this cycle —
+        // the next cycle is the one that exercises the skip path.
+        drop(store);
+        drop(log);
+        drop(executor);
+    }
+
+    // Out-of-band mutation: open the persistent store directly and
+    // change the saldo. Marker stays at the same seq.
+    {
+        let mut store =
+            SurrealStore::new_persistent(&store_path).expect("reopen for poison");
+        store.seed(
+            "Caja",
+            caja,
+            json!({
+                "id": caja.to_string(),
+                "name": "A",
+                "saldo": 999_999_i64, // poison
+                "currency": "USD",
+            }),
+        );
+        // The marker we set during the WAL flow stays intact — seed()
+        // alone does not bump it.
+    }
+
+    // Cycle 2: run_server with the poisoned store. Marker == log_last
+    // (still 0 from the seed) → skip path → poison saldo survives.
+    let executor = Executor::load_module(treasury_module()).expect("load");
+    let log = EventLog::open(&log_path).expect("reopen log");
+    let store = SurrealStore::new_persistent(&store_path).expect("reopen final");
+
+    let socket_for_client = socket_path1.clone();
+    let client = thread::spawn(move || -> Result<(), String> {
+        let mut conn = connect_with_retry(&socket_for_client);
+        let resp = exchange(
+            &mut conn,
+            json!({"op": "load", "entity": "Caja", "id": caja.to_string()}),
+        );
+        let saldo = resp["value"]["saldo"].as_i64();
+        let _ = exchange(&mut conn, json!({"op": "shutdown"}));
+        if saldo != Some(999_999) {
+            return Err(format!(
+                "skip-replay should preserve out-of-band saldo (999_999), got {:?}",
+                saldo
+            ));
+        }
+        Ok(())
+    });
+
+    run_server(executor, log, store, None, &socket_path1).expect("server clean exit");
+    client.join().unwrap().expect("client assertions");
+
+    // Cycle 3: explicitly invalidate the marker (simulating a backend
+    // that lost track) and confirm full replay restores log-canonical
+    // state — wiping the poison.
+    {
+        let mut store = SurrealStore::new_persistent(&store_path).expect("reopen for marker reset");
+        // Force the marker into the "uninitialized" state by clearing
+        // and reseeding the legitimate record without bumping it. The
+        // simplest way is to clear() then re-seed; clear nukes
+        // last_applied_seq.
+        store.clear().expect("clear");
+        store.seed(
+            "Caja",
+            caja,
+            json!({
+                "id": caja.to_string(),
+                "name": "A",
+                "saldo": 999_999_i64, // poison still present
+                "currency": "USD",
+            }),
+        );
+        // last_applied_seq is now None → mismatch with log_last → full replay path.
+    }
+
+    let executor = Executor::load_module(treasury_module()).expect("load");
+    let log = EventLog::open(&log_path).expect("reopen");
+    let store = SurrealStore::new_persistent(&store_path).expect("reopen");
+
+    let socket_for_client = socket_path2.clone();
+    let client = thread::spawn(move || -> Result<(), String> {
+        let mut conn = connect_with_retry(&socket_for_client);
+        let resp = exchange(
+            &mut conn,
+            json!({"op": "load", "entity": "Caja", "id": caja.to_string()}),
+        );
+        let saldo = resp["value"]["saldo"].as_i64();
+        let _ = exchange(&mut conn, json!({"op": "shutdown"}));
+        if saldo != Some(100_000) {
+            return Err(format!(
+                "full replay should restore canonical saldo (100_000), got {:?}",
+                saldo
+            ));
+        }
+        Ok(())
+    });
+
+    run_server(executor, log, store, None, &socket_path2).expect("server clean exit");
+    client.join().unwrap().expect("client assertions");
+
+    let _ = std::fs::remove_file(&log_path);
+    let _ = std::fs::remove_dir_all(&store_path);
+}
diff --git a/crates/modules/nakui/core/tests/sales.rs b/crates/modules/nakui/core/tests/sales.rs
new file mode 100644
index 0000000..a9e5e49
--- /dev/null
+++ b/crates/modules/nakui/core/tests/sales.rs
@@ -0,0 +1,164 @@
+//! Cross-module integration tests. The `sales` module references entities
+//! defined in `treasury` and `inventory` via its manifest's `schemas` list.
+//! These tests assert:
+//!   - The kernel correctly bundles multiple .k files at module load.
+//!   - Per-entity KCL post-checks fire against the right schema even when
+//!     three are concatenated.
+//!   - A non-conserving morphism (sale = stock−1, caja+price) passes the
+//!     kernel cleanly because no `invariants.conserve` was declared.
+
+use std::path::{Path, PathBuf};
+
+use nakui_core::executor::{ExecError, Executor};
+use nakui_core::store::{MemoryStore, Store};
+use serde_json::{Value, json};
+use uuid::Uuid;
+
+fn workspace_root() -> PathBuf {
+    Path::new(env!("CARGO_MANIFEST_DIR"))
+        .parent()
+        .expect("workspace root above core/")
+        .to_path_buf()
+}
+
+fn sales_module() -> PathBuf {
+    workspace_root().join("modules/sales")
+}
+
+fn caja_saldo(store: &MemoryStore, id: Uuid) -> i64 {
+    store
+        .load("Caja", id)
+        .and_then(|v| v.get("saldo").and_then(Value::as_i64))
+        .expect("caja with saldo")
+}
+
+fn stock_cantidad(store: &MemoryStore, id: Uuid) -> i64 {
+    store
+        .load("Stock", id)
+        .and_then(|v| v.get("cantidad").and_then(Value::as_i64))
+        .expect("stock with cantidad")
+}
+
+fn seed(store: &mut MemoryStore) -> (Uuid, Uuid) {
+    let stock = Uuid::new_v4();
+    let caja = Uuid::new_v4();
+    store.seed(
+        "Stock",
+        stock,
+        json!({
+            "id": stock.to_string(),
+            "sku_id": "sku-test",
+            "ubicacion": "test-loc",
+            "cantidad": 500_i64,
+        }),
+    );
+    store.seed(
+        "Caja",
+        caja,
+        json!({
+            "id": caja.to_string(),
+            "name": "Caja Test",
+            "saldo": 1_000_000_i64,
+            "currency": "USD",
+        }),
+    );
+    (stock, caja)
+}
+
+#[test]
+fn sale_decreases_stock_and_increases_caja() {
+    let exec = Executor::load_module(sales_module()).expect("load module");
+    let mut store = MemoryStore::new();
+    let (stock, caja) = seed(&mut store);
+
+    let venta_id = Uuid::new_v4();
+    let ops = exec
+        .run(
+            &mut store,
+            "vender",
+            &[("stock", stock), ("caja", caja)],
+            json!({
+                "cantidad": 100_i64,
+                "precio_unitario": 5_000_i64,
+                "timestamp": "2026-05-04T10:00:00Z",
+                "venta_id": venta_id.to_string(),
+            }),
+        )
+        .expect("sale must succeed");
+
+    assert_eq!(ops.len(), 3, "2 sets + 1 create");
+    assert_eq!(stock_cantidad(&store, stock), 400);
+    assert_eq!(caja_saldo(&store, caja), 1_500_000);
+
+    let venta = store
+        .load("Venta", venta_id)
+        .expect("venta must be persisted");
+    assert_eq!(venta.get("total").and_then(Value::as_i64), Some(500_000));
+    assert_eq!(venta.get("cantidad").and_then(Value::as_i64), Some(100));
+    assert_eq!(
+        venta.get("currency").and_then(Value::as_str),
+        Some("USD")
+    );
+}
+
+#[test]
+fn overdraw_stock_rejected_by_inventory_post_check() {
+    let exec = Executor::load_module(sales_module()).expect("load module");
+    let mut store = MemoryStore::new();
+    let (stock, caja) = seed(&mut store);
+
+    let result = exec.run(
+        &mut store,
+        "vender",
+        &[("stock", stock), ("caja", caja)],
+        json!({
+            "cantidad": 9999_i64,
+            "precio_unitario": 100_i64,
+            "timestamp": "2026-05-04T10:00:00Z",
+            "venta_id": Uuid::new_v4().to_string(),
+        }),
+    );
+
+    match result {
+        Err(ExecError::KclPost { role, entity, .. }) => {
+            assert_eq!(role, "stock");
+            assert_eq!(entity, "Stock");
+        }
+        other => panic!("expected KclPost on stock, got {:?}", other),
+    }
+    assert_eq!(stock_cantidad(&store, stock), 500);
+    assert_eq!(caja_saldo(&store, caja), 1_000_000);
+}
+
+#[test]
+fn venta_total_invariant_caught_when_corrupted() {
+    // The Venta schema's check block enforces `total == cantidad * precio`.
+    // The production script always produces a consistent total. To prove
+    // the schema check fires, this test would need a buggy script — that's
+    // covered indirectly: if anyone breaks the script, this fails. For now
+    // we just confirm a clean sale's Venta passes its own invariant.
+    let exec = Executor::load_module(sales_module()).expect("load module");
+    let mut store = MemoryStore::new();
+    let (stock, caja) = seed(&mut store);
+    let venta_id = Uuid::new_v4();
+
+    exec.run(
+        &mut store,
+        "vender",
+        &[("stock", stock), ("caja", caja)],
+        json!({
+            "cantidad": 7_i64,
+            "precio_unitario": 13_i64,
+            "timestamp": "2026-05-04T10:00:00Z",
+            "venta_id": venta_id.to_string(),
+        }),
+    )
+    .expect("sale must pass");
+
+    let venta = store.load("Venta", venta_id).expect("venta");
+    assert_eq!(
+        venta.get("total").and_then(Value::as_i64),
+        Some(7 * 13),
+        "Venta.total must equal cantidad * precio"
+    );
+}
diff --git a/crates/modules/nakui/core/tests/schema_versioning.rs b/crates/modules/nakui/core/tests/schema_versioning.rs
new file mode 100644
index 0000000..b8a5542
--- /dev/null
+++ b/crates/modules/nakui/core/tests/schema_versioning.rs
@@ -0,0 +1,444 @@
+//! Schema versioning: every logged morphism carries a `schema_hash` that
+//! pins it to the (kcl + manifest spec + rhai) bundle active at write
+//! time. `verify_log` rejects logs whose entries were produced under
+//! rules that no longer match the loaded executor.
+//!
+//! The tests here build a *temp copy* of the treasury module so we can
+//! mutate its files without polluting the source tree. Each test cleans
+//! its temp dir even if it panics (the helper drops via `TempModule`).
+
+use std::path::{Path, PathBuf};
+
+use nakui_core::event_log::{
+    EventLog, LogEntry, VerifyError, execute_and_log, replay, seed_and_log, verify_log,
+};
+use nakui_core::executor::Executor;
+use nakui_core::store::MemoryStore;
+use serde_json::{Value, json};
+use uuid::Uuid;
+
+fn workspace_root() -> PathBuf {
+    Path::new(env!("CARGO_MANIFEST_DIR"))
+        .parent()
+        .expect("workspace root above core/")
+        .to_path_buf()
+}
+
+fn treasury_module() -> PathBuf {
+    workspace_root().join("modules/treasury")
+}
+
+fn fresh_log_path() -> PathBuf {
+    std::env::temp_dir().join(format!("nakui_schema_{}.jsonl", Uuid::new_v4()))
+}
+
+/// Owned temp copy of a module directory. Drops the entire tree.
+struct TempModule {
+    pub path: PathBuf,
+}
+
+impl TempModule {
+    fn from(src: &Path) -> Self {
+        let dst = std::env::temp_dir().join(format!("nakui_module_{}", Uuid::new_v4()));
+        copy_dir_recursive(src, &dst).expect("copy module");
+        Self { path: dst }
+    }
+}
+
+impl Drop for TempModule {
+    fn drop(&mut self) {
+        let _ = std::fs::remove_dir_all(&self.path);
+    }
+}
+
+fn copy_dir_recursive(src: &Path, dst: &Path) -> std::io::Result<()> {
+    std::fs::create_dir_all(dst)?;
+    for entry in std::fs::read_dir(src)? {
+        let entry = entry?;
+        let ty = entry.file_type()?;
+        let dst_path = dst.join(entry.file_name());
+        if ty.is_dir() {
+            copy_dir_recursive(&entry.path(), &dst_path)?;
+        } else {
+            std::fs::copy(entry.path(), &dst_path)?;
+        }
+    }
+    Ok(())
+}
+
+fn deposit_5k(
+    exec: &Executor,
+    store: &mut MemoryStore,
+    log: &mut EventLog,
+    caja: Uuid,
+) {
+    execute_and_log(
+        exec,
+        store,
+        log,
+        "register_cash_move",
+        &[("caja", caja)],
+        json!({
+            "monto": 5_000_i64,
+            "tipo": "in",
+            "timestamp": "2026-05-04T10:00:00Z",
+            "memo": "x",
+            "movimiento_id": Uuid::new_v4().to_string(),
+        }),
+    )
+    .expect("deposit");
+}
+
+fn seed_caja(exec: &Executor, store: &mut MemoryStore, log: &mut EventLog, id: Uuid) {
+    seed_and_log(
+        exec,
+        store,
+        log,
+        "Caja",
+        id,
+        json!({"id": id.to_string(), "name": "A", "saldo": 100_000_i64, "currency": "USD"}),
+    )
+    .unwrap();
+}
+
+#[test]
+fn executor_exposes_per_morphism_schema_hash() {
+    let exec = Executor::load_module(treasury_module()).expect("load");
+    let h_deposit = exec
+        .schema_hash("register_cash_move")
+        .expect("register_cash_move has a hash");
+    let h_transfer = exec
+        .schema_hash("transfer_between_cajas")
+        .expect("transfer_between_cajas has a hash");
+    assert_ne!(
+        h_deposit, h_transfer,
+        "different morphisms must have different hashes"
+    );
+    assert!(
+        exec.schema_hash("not_a_real_morphism").is_none(),
+        "unknown morphisms have no hash"
+    );
+
+    // Re-loading the same module yields the same hashes — the contract
+    // depends only on the bytes on disk, not load-time state.
+    let exec2 = Executor::load_module(treasury_module()).expect("reload");
+    assert_eq!(exec.schema_hash("register_cash_move"), exec2.schema_hash("register_cash_move"));
+}
+
+#[test]
+fn execute_and_log_writes_schema_hash_into_entries() {
+    let temp = TempModule::from(&treasury_module());
+    let exec = Executor::load_module(&temp.path).expect("load");
+    let log_path = fresh_log_path();
+    let mut log = EventLog::open(&log_path).unwrap();
+    let mut store = MemoryStore::new();
+
+    let a = Uuid::new_v4();
+    seed_caja(&exec, &mut store, &mut log, a);
+    deposit_5k(&exec, &mut store, &mut log, a);
+
+    let entries = log.entries().unwrap();
+    let morphism_entry = entries
+        .iter()
+        .find_map(|e| match e {
+            LogEntry::Morphism { schema_hash, .. } => Some(*schema_hash),
+            _ => None,
+        })
+        .expect("morphism entry present");
+    assert_eq!(
+        morphism_entry,
+        Some(exec.schema_hash("register_cash_move").unwrap()),
+        "logged hash must equal the executor's hash for that morphism"
+    );
+
+    let _ = std::fs::remove_file(&log_path);
+}
+
+#[test]
+fn verify_log_passes_when_module_is_unchanged() {
+    let temp = TempModule::from(&treasury_module());
+    let exec = Executor::load_module(&temp.path).expect("load");
+    let log_path = fresh_log_path();
+    let mut log = EventLog::open(&log_path).unwrap();
+    let mut store = MemoryStore::new();
+
+    let a = Uuid::new_v4();
+    seed_caja(&exec, &mut store, &mut log, a);
+    deposit_5k(&exec, &mut store, &mut log, a);
+
+    verify_log(&log, &exec).expect("clean module → verify ok");
+
+    let _ = std::fs::remove_file(&log_path);
+}
+
+#[test]
+fn verify_log_rejects_log_after_morphism_script_changes() {
+    let temp = TempModule::from(&treasury_module());
+
+    // Write a log under the original script.
+    let log_path = fresh_log_path();
+    let a = Uuid::new_v4();
+    let original_hash;
+    {
+        let exec = Executor::load_module(&temp.path).expect("load v1");
+        original_hash = exec.schema_hash("register_cash_move").unwrap();
+        let mut log = EventLog::open(&log_path).unwrap();
+        let mut store = MemoryStore::new();
+        seed_caja(&exec, &mut store, &mut log, a);
+        deposit_5k(&exec, &mut store, &mut log, a);
+    }
+
+    // Mutate the script with a real (non-cosmetic) change — prepend a
+    // new statement. The normalizer preserves this since it changes
+    // tokens, not just whitespace/comments.
+    let script_path = temp.path.join("morphisms/register_cash_move.rhai");
+    let original = std::fs::read_to_string(&script_path).expect("read script");
+    std::fs::write(
+        &script_path,
+        format!("let _audit_marker = 42;\n{}", original),
+    )
+    .expect("write script");
+
+    // Reload — the hash for register_cash_move must change.
+    let exec2 = Executor::load_module(&temp.path).expect("reload v2");
+    let new_hash = exec2.schema_hash("register_cash_move").unwrap();
+    assert_ne!(original_hash, new_hash, "real source edit must move the hash");
+
+    // verify_log must surface SchemaMismatch, not OpsMismatch — the
+    // schema check runs first because "rules changed" is more
+    // actionable than "ops differ for some reason."
+    let log = EventLog::open(&log_path).unwrap();
+    match verify_log(&log, &exec2) {
+        Err(VerifyError::SchemaMismatch {
+            morphism,
+            logged,
+            current,
+            ..
+        }) => {
+            assert_eq!(morphism, "register_cash_move");
+            assert_eq!(logged, original_hash);
+            assert_eq!(current, new_hash);
+        }
+        other => panic!("expected SchemaMismatch, got {:?}", other),
+    }
+
+    // Replay still works — it doesn't validate against the executor.
+    let replayed = replay(&log).expect("replay is schema-agnostic");
+    assert!(replayed.records().contains_key("Caja"));
+
+    let _ = std::fs::remove_file(&log_path);
+}
+
+#[test]
+fn legacy_log_without_schema_hash_still_replays_and_verifies() {
+    // Hand-craft a log entry that omits schema_hash entirely — what an
+    // older nakui-core would have written. The Option default lets it
+    // deserialize, replay walks ops the normal way, and verify_log
+    // skips the schema check because the entry predates the contract.
+    let log_path = fresh_log_path();
+    let a = Uuid::new_v4();
+    {
+        let exec = Executor::load_module(treasury_module()).expect("load");
+        let mut log = EventLog::open(&log_path).unwrap();
+        let mut store = MemoryStore::new();
+        seed_caja(&exec, &mut store, &mut log, a);
+        // Now write a Morphism entry by hand, bypassing execute_and_log,
+        // simulating a log produced by an older binary.
+        let entry: Value = json!({
+            "kind": "morphism",
+            "seq": log.next_seq(),
+            "morphism": "register_cash_move",
+            "inputs": {"caja": a.to_string()},
+            "params": {
+                "monto": 5_000,
+                "tipo": "in",
+                "timestamp": "2026-05-04T10:00:00Z",
+                "memo": "legacy",
+                "movimiento_id": Uuid::new_v4().to_string(),
+            },
+            "ops": []
+            // NOTE: no schema_hash field — that's the legacy shape.
+        });
+        // Append via raw IO to skip log.append's monotonic check (which
+        // we trivially satisfy anyway since seq is correct).
+        let line = serde_json::to_string(&entry).unwrap();
+        let mut f = std::fs::OpenOptions::new()
+            .append(true)
+            .open(&log_path)
+            .unwrap();
+        use std::io::Write;
+        f.write_all(line.as_bytes()).unwrap();
+        f.write_all(b"\n").unwrap();
+        f.sync_all().unwrap();
+    }
+
+    // Replay must succeed (no schema check).
+    let log = EventLog::open(&log_path).unwrap();
+    let entries = log.entries().expect("entries parse");
+    assert_eq!(entries.len(), 2, "seed + legacy morphism");
+    let legacy = entries
+        .iter()
+        .find_map(|e| match e {
+            LogEntry::Morphism { schema_hash, .. } => Some(*schema_hash),
+            _ => None,
+        })
+        .expect("morphism present");
+    assert!(
+        legacy.is_none(),
+        "legacy entry must deserialize with schema_hash=None"
+    );
+
+    let _ = std::fs::remove_file(&log_path);
+}
+
+#[test]
+fn executor_exposes_schema_bundle_hash() {
+    let exec1 = Executor::load_module(treasury_module()).expect("load 1");
+    let exec2 = Executor::load_module(treasury_module()).expect("load 2");
+    assert_eq!(
+        exec1.schema_bundle_hash, exec2.schema_bundle_hash,
+        "bundle hash must be stable across re-loads of the same module"
+    );
+
+    // The bundle hash and the per-morphism hash live in different
+    // tag namespaces (`nakui-bundle-v1` vs `nakui-schema-v1`), so they
+    // can't accidentally collide even when the script bytes are
+    // empty/identical.
+    let morph_hash = exec1.schema_hash("register_cash_move").unwrap();
+    assert_ne!(exec1.schema_bundle_hash, morph_hash);
+}
+
+#[test]
+fn seed_and_log_writes_bundle_hash_into_seed_entries() {
+    let exec = Executor::load_module(treasury_module()).expect("load");
+    let log_path = fresh_log_path();
+    let mut log = EventLog::open(&log_path).unwrap();
+    let mut store = MemoryStore::new();
+    let id = Uuid::new_v4();
+    seed_caja(&exec, &mut store, &mut log, id);
+
+    let entries = log.entries().unwrap();
+    let seed_hash = entries
+        .iter()
+        .find_map(|e| match e {
+            LogEntry::Seed { schema_hash, .. } => Some(*schema_hash),
+            _ => None,
+        })
+        .expect("seed entry present");
+    assert_eq!(
+        seed_hash,
+        Some(exec.schema_bundle_hash),
+        "logged seed hash must equal the executor's bundle hash"
+    );
+
+    let _ = std::fs::remove_file(&log_path);
+}
+
+#[test]
+fn verify_log_rejects_seed_after_schema_kcl_changes() {
+    let temp = TempModule::from(&treasury_module());
+    let log_path = fresh_log_path();
+    let id = Uuid::new_v4();
+    let original_hash;
+    {
+        let exec = Executor::load_module(&temp.path).expect("load v1");
+        original_hash = exec.schema_bundle_hash;
+        let mut log = EventLog::open(&log_path).unwrap();
+        let mut store = MemoryStore::new();
+        seed_caja(&exec, &mut store, &mut log, id);
+    }
+
+    // Mutate schema.k. Even a comment is enough — bundle hash is byte-
+    // level for the same false-positive-over-false-negative reason as
+    // morphism hashes.
+    let schema_path = temp.path.join("schema.k");
+    let original = std::fs::read_to_string(&schema_path).expect("read schema");
+    std::fs::write(
+        &schema_path,
+        format!("{}\n# seed-versioning-test mutation\n", original),
+    )
+    .expect("write schema");
+
+    let exec2 = Executor::load_module(&temp.path).expect("reload v2");
+    let new_hash = exec2.schema_bundle_hash;
+    assert_ne!(original_hash, new_hash, "schema.k byte change must move the bundle hash");
+
+    let log = EventLog::open(&log_path).unwrap();
+    match verify_log(&log, &exec2) {
+        Err(VerifyError::SeedSchemaMismatch {
+            entity,
+            id: mismatched_id,
+            logged,
+            current,
+            ..
+        }) => {
+            assert_eq!(entity, "Caja");
+            assert_eq!(mismatched_id, id);
+            assert_eq!(logged, original_hash);
+            assert_eq!(current, new_hash);
+        }
+        other => panic!("expected SeedSchemaMismatch, got {:?}", other),
+    }
+
+    let _ = std::fs::remove_file(&log_path);
+}
+
+#[test]
+fn comment_only_edits_do_not_invalidate_the_hash() {
+    // The improvement that motivated the AST-aware normalization:
+    // operators leaving TODOs or whitespace edits in scripts no longer
+    // re-stamps every log entry. Same script behaviour ⇒ same hash.
+    let temp = TempModule::from(&treasury_module());
+    let exec1 = Executor::load_module(&temp.path).expect("load v1");
+    let h1 = exec1.schema_hash("register_cash_move").unwrap();
+
+    let script_path = temp.path.join("morphisms/register_cash_move.rhai");
+    let original = std::fs::read_to_string(&script_path).expect("read");
+    std::fs::write(
+        &script_path,
+        format!(
+            "// new top-level comment\n\n\n{}\n\n// trailing TODO\n/*\n  block\n  comment\n*/\n",
+            original.replace("// states.caja:", "//   states.caja:    EDITED COMMENT"),
+        ),
+    )
+    .expect("write");
+
+    let exec2 = Executor::load_module(&temp.path).expect("reload v2");
+    let h2 = exec2.schema_hash("register_cash_move").unwrap();
+    assert_eq!(
+        h1, h2,
+        "comment-only and whitespace-only edits must not move the hash"
+    );
+
+    // Sanity: the bundle hash also stays intact (we didn't touch schema.k).
+    assert_eq!(exec1.schema_bundle_hash, exec2.schema_bundle_hash);
+}
+
+#[test]
+fn morphism_script_change_does_not_flag_unrelated_seeds() {
+    // Bundle hash covers schema.k only — a .rhai edit moves the
+    // morphism hash but leaves the bundle hash alone. So existing
+    // seeds verify cleanly even when a morphism's behaviour changed.
+    let temp = TempModule::from(&treasury_module());
+    let log_path = fresh_log_path();
+    let id = Uuid::new_v4();
+    {
+        let exec = Executor::load_module(&temp.path).expect("load v1");
+        let mut log = EventLog::open(&log_path).unwrap();
+        let mut store = MemoryStore::new();
+        seed_caja(&exec, &mut store, &mut log, id);
+        // No morphism executed — only the seed is in the log.
+    }
+
+    // Modify a Rhai script. Bundle stays the same.
+    let script_path = temp.path.join("morphisms/register_cash_move.rhai");
+    let original = std::fs::read_to_string(&script_path).expect("read");
+    std::fs::write(&script_path, format!("{}\n// rhai-only mutation\n", original)).unwrap();
+
+    let exec2 = Executor::load_module(&temp.path).expect("reload");
+    let log = EventLog::open(&log_path).unwrap();
+    verify_log(&log, &exec2)
+        .expect("seed-only log should pass verify after a morphism-only change");
+
+    let _ = std::fs::remove_file(&log_path);
+}
diff --git a/crates/modules/nakui/core/tests/snapshot_chain.rs b/crates/modules/nakui/core/tests/snapshot_chain.rs
new file mode 100644
index 0000000..afecc30
--- /dev/null
+++ b/crates/modules/nakui/core/tests/snapshot_chain.rs
@@ -0,0 +1,400 @@
+//! End-to-end tests for the snapshot lifecycle: capture, compact, and
+//! boot from snapshot. Plus the schema-hash binding that ties a snapshot
+//! to the bundle that produced it.
+
+use std::io::{BufRead, BufReader, Write};
+use std::os::unix::net::UnixStream;
+use std::path::{Path, PathBuf};
+use std::thread;
+use std::time::Duration;
+
+use nakui_core::event_log::{
+    EventLog, Snapshot, SnapshotMismatchError, execute_and_log, replay, seed_and_log,
+};
+use nakui_core::executor::Executor;
+use nakui_core::run::run_server;
+use nakui_core::store::{MemoryStore, Store};
+use serde_json::{Value, json};
+use uuid::Uuid;
+
+fn workspace_root() -> PathBuf {
+    Path::new(env!("CARGO_MANIFEST_DIR"))
+        .parent()
+        .expect("workspace root above core/")
+        .to_path_buf()
+}
+
+fn treasury_module() -> PathBuf {
+    workspace_root().join("modules/treasury")
+}
+
+fn fresh_log_path() -> PathBuf {
+    std::env::temp_dir().join(format!("nakui_snap_log_{}.jsonl", Uuid::new_v4()))
+}
+
+fn fresh_snap_path() -> PathBuf {
+    std::env::temp_dir().join(format!("nakui_snap_{}.json", Uuid::new_v4()))
+}
+
+fn fresh_socket_path() -> PathBuf {
+    std::env::temp_dir().join(format!("nakui_snap_run_{}.sock", Uuid::new_v4()))
+}
+
+fn seed_caja(exec: &Executor, store: &mut MemoryStore, log: &mut EventLog, id: Uuid, saldo: i64) {
+    seed_and_log(
+        exec,
+        store,
+        log,
+        "Caja",
+        id,
+        json!({"id": id.to_string(), "name": "A", "saldo": saldo, "currency": "USD"}),
+    )
+    .unwrap();
+}
+
+fn deposit(exec: &Executor, store: &mut MemoryStore, log: &mut EventLog, caja: Uuid, monto: i64) {
+    execute_and_log(
+        exec,
+        store,
+        log,
+        "register_cash_move",
+        &[("caja", caja)],
+        json!({
+            "monto": monto,
+            "tipo": "in",
+            "timestamp": "2026-05-04T10:00:00Z",
+            "memo": "x",
+            "movimiento_id": Uuid::new_v4().to_string(),
+        }),
+    )
+    .unwrap();
+}
+
+#[test]
+fn module_schema_hash_is_stable_and_independent_of_load_order() {
+    let exec1 = Executor::load_module(treasury_module()).expect("load 1");
+    let exec2 = Executor::load_module(treasury_module()).expect("load 2");
+    assert_eq!(
+        exec1.module_schema_hash(),
+        exec2.module_schema_hash(),
+        "two clean loads of the same module → identical module hash"
+    );
+}
+
+#[test]
+fn capture_records_executor_hash_legacy_does_not() {
+    let exec = Executor::load_module(treasury_module()).expect("load");
+    let mut store = MemoryStore::new();
+    store.seed("Caja", Uuid::new_v4(), json!({"x": 1}));
+
+    let captured = Snapshot::capture(&store, 0, &exec);
+    assert_eq!(captured.schema_hash, Some(exec.module_schema_hash()));
+
+    let legacy = Snapshot::from_memory_store(&store, 0);
+    assert_eq!(legacy.schema_hash, None, "legacy constructor opts out");
+
+    captured
+        .ensure_compatible_with(&exec)
+        .expect("captured snapshot is compatible with the executor that built it");
+    legacy
+        .ensure_compatible_with(&exec)
+        .expect("legacy snapshot has no hash → no check, passes");
+}
+
+#[test]
+fn ensure_compatible_with_rejects_mismatched_hash() {
+    let exec = Executor::load_module(treasury_module()).expect("load");
+    let mut snap = Snapshot::capture(&MemoryStore::new(), 0, &exec);
+    // Tamper with the hash to simulate a snapshot from a different bundle.
+    snap.schema_hash = Some([0xAB; 32]);
+    match snap.ensure_compatible_with(&exec) {
+        Err(SnapshotMismatchError::SchemaMismatch { .. }) => {}
+        other => panic!("expected SchemaMismatch, got {:?}", other),
+    }
+}
+
+#[test]
+fn snapshot_then_compact_then_run_server_resumes_correctly() {
+    // The full operator workflow:
+    //   1. Run a series of WAL-validated ops.
+    //   2. Capture a snapshot covering the last seq.
+    //   3. Compact the log so it only retains entries past snap.seq.
+    //   4. Start a server pointing at the (compacted) log + snapshot.
+    //   5. Confirm the server's state is correct via the load op.
+    //
+    // After step 3 the log alone can't reconstruct the state — the
+    // snapshot is the only thing that proves the server isn't lying.
+    let log_path = fresh_log_path();
+    let snap_path = fresh_snap_path();
+    let socket_path = fresh_socket_path();
+
+    let caja = Uuid::new_v4();
+    let snap_seq;
+    let captured_module_hash;
+    {
+        let exec = Executor::load_module(treasury_module()).expect("load");
+        captured_module_hash = exec.module_schema_hash();
+        let mut log = EventLog::open(&log_path).unwrap();
+        let mut store = MemoryStore::new();
+        seed_caja(&exec, &mut store, &mut log, caja, 100_000);
+        deposit(&exec, &mut store, &mut log, caja, 5_000);
+        deposit(&exec, &mut store, &mut log, caja, 7_500);
+
+        snap_seq = log.next_seq() - 1;
+        let snap = Snapshot::capture(&store, snap_seq, &exec);
+        snap.write(&snap_path).unwrap();
+        log.compact_through(snap_seq).unwrap();
+
+        // Sanity: after compaction the log has no surviving entries.
+        let surviving = log.entries().unwrap();
+        assert_eq!(surviving.len(), 0);
+        // But next_seq is preserved, so future appends keep monotonicity.
+        assert_eq!(log.next_seq(), snap_seq + 1);
+    }
+
+    // Verify the snapshot file carries the captured hash (resilient
+    // through write+read).
+    let reloaded = Snapshot::load(&snap_path).unwrap().unwrap();
+    assert_eq!(reloaded.schema_hash, Some(captured_module_hash));
+    assert_eq!(reloaded.seq, snap_seq);
+
+    // Boot the server with snapshot + compacted log.
+    let executor = Executor::load_module(treasury_module()).expect("reload");
+    let log = EventLog::open(&log_path).unwrap();
+    let store = MemoryStore::new();
+
+    let socket_for_client = socket_path.clone();
+    let client = thread::spawn(move || -> Result<(), String> {
+        let mut conn = connect_with_retry(&socket_for_client);
+        let resp = exchange(&mut conn, json!({"op": "load", "entity": "Caja", "id": caja.to_string()}));
+        if resp["value"]["saldo"].as_i64() != Some(112_500) {
+            return Err(format!(
+                "expected saldo 112_500 (100k seed + 5k + 7.5k from snapshot), got {}",
+                resp
+            ));
+        }
+        // Append a new op via the live server and load it back —
+        // confirms the WAL still works on top of a snapshot-loaded state.
+        let resp = exchange(
+            &mut conn,
+            json!({
+                "op": "execute",
+                "morphism": "register_cash_move",
+                "inputs": {"caja": caja.to_string()},
+                "params": {
+                    "monto": 1_000_i64,
+                    "tipo": "in",
+                    "timestamp": "2026-05-04T11:00:00Z",
+                    "memo": "post-snap",
+                    "movimiento_id": Uuid::new_v4().to_string(),
+                }
+            }),
+        );
+        if resp["ok"] != json!(true) {
+            return Err(format!("execute on snapshot-booted server failed: {}", resp));
+        }
+        let resp = exchange(&mut conn, json!({"op": "load", "entity": "Caja", "id": caja.to_string()}));
+        if resp["value"]["saldo"].as_i64() != Some(113_500) {
+            return Err(format!("post-execute saldo wrong: {}", resp));
+        }
+        send_shutdown(&mut conn);
+        Ok(())
+    });
+
+    run_server(executor, log, store, Some(reloaded), &socket_path).expect("server clean exit");
+    client.join().unwrap().expect("client assertions");
+
+    let _ = std::fs::remove_file(&log_path);
+    let _ = std::fs::remove_file(&snap_path);
+}
+
+#[test]
+fn run_server_refuses_snapshot_with_wrong_schema_hash() {
+    let log_path = fresh_log_path();
+    let socket_path = fresh_socket_path();
+
+    let caja = Uuid::new_v4();
+    {
+        let exec = Executor::load_module(treasury_module()).expect("load");
+        let mut log = EventLog::open(&log_path).unwrap();
+        let mut store = MemoryStore::new();
+        seed_caja(&exec, &mut store, &mut log, caja, 100_000);
+        deposit(&exec, &mut store, &mut log, caja, 5_000);
+    }
+
+    // Build a snapshot with a fabricated hash — simulates "snapshot
+    // taken under module A, loaded against module B."
+    let exec = Executor::load_module(treasury_module()).expect("reload");
+    let log = EventLog::open(&log_path).unwrap();
+    let snap_state = replay(&log).unwrap();
+    let last_seq = log.entries().unwrap().last().unwrap().seq();
+    let mut bad_snap = Snapshot::capture(&snap_state, last_seq, &exec);
+    bad_snap.schema_hash = Some([0xAB; 32]);
+
+    let store = MemoryStore::new();
+    let result = run_server(exec, log, store, Some(bad_snap), &socket_path);
+    assert!(
+        matches!(
+            result,
+            Err(nakui_core::run::RunError::SnapshotMismatch(_))
+        ),
+        "expected SnapshotMismatch, got {:?}",
+        result
+    );
+    // Socket must not have been bound.
+    assert!(!socket_path.exists());
+
+    let _ = std::fs::remove_file(&log_path);
+}
+
+#[test]
+fn run_server_detects_gap_between_snapshot_and_compacted_log() {
+    // Snapshot says it covers up to seq K. Log was compacted further,
+    // so its first remaining entry is K+5 — entries K+1..=K+4 are
+    // gone. run_server must refuse rather than silently fabricate a
+    // state that drops events.
+    let log_path = fresh_log_path();
+    let socket_path = fresh_socket_path();
+
+    let caja = Uuid::new_v4();
+    let exec = Executor::load_module(treasury_module()).expect("load");
+    {
+        let mut log = EventLog::open(&log_path).unwrap();
+        let mut store = MemoryStore::new();
+        seed_caja(&exec, &mut store, &mut log, caja, 100_000);
+        deposit(&exec, &mut store, &mut log, caja, 1_000);
+        deposit(&exec, &mut store, &mut log, caja, 1_000);
+        deposit(&exec, &mut store, &mut log, caja, 1_000);
+        deposit(&exec, &mut store, &mut log, caja, 1_000);
+        deposit(&exec, &mut store, &mut log, caja, 1_000);
+    }
+
+    // Snapshot at seq 0 (only the seed).
+    let mut log = EventLog::open(&log_path).unwrap();
+    let mut state = MemoryStore::new();
+    nakui_core::event_log::replay_with_snapshot_into(&log, None, &mut state).unwrap();
+    let snap = Snapshot::capture(&state, 0, &exec);
+
+    // Compact the log past the snapshot — drop seqs 0..=3, leaving
+    // entries from seq 4 onward. The snapshot can't reconstruct the
+    // missing tail.
+    log.compact_through(3).unwrap();
+    drop(log);
+
+    let exec = Executor::load_module(treasury_module()).expect("reload");
+    let log = EventLog::open(&log_path).unwrap();
+    let store = MemoryStore::new();
+    let result = run_server(exec, log, store, Some(snap), &socket_path);
+    match result {
+        Err(nakui_core::run::RunError::SnapshotGap {
+            snap_seq,
+            log_first_seq,
+            expected,
+        }) => {
+            assert_eq!(snap_seq, 0);
+            assert_eq!(expected, 1);
+            assert!(
+                log_first_seq >= 4,
+                "log's first surviving entry should be ≥ 4, got {}",
+                log_first_seq
+            );
+        }
+        other => panic!("expected SnapshotGap, got {:?}", other),
+    }
+
+    let _ = std::fs::remove_file(&log_path);
+}
+
+#[test]
+fn snapshot_write_overwrites_existing_atomically() {
+    // Two snapshots at different seqs written to the same path. The
+    // second must completely replace the first; load() returns the
+    // newer one.
+    let snap_path = fresh_snap_path();
+    let exec = Executor::load_module(treasury_module()).expect("load");
+
+    let s1 = Snapshot::capture(&MemoryStore::new(), 0, &exec);
+    s1.write(&snap_path).expect("write first");
+    let loaded = Snapshot::load(&snap_path).unwrap().unwrap();
+    assert_eq!(loaded.seq, 0);
+
+    // Now write a different snapshot to the same path.
+    let mut store = MemoryStore::new();
+    let id = Uuid::new_v4();
+    store.seed("Caja", id, json!({"id": id.to_string(), "saldo": 7}));
+    let s2 = Snapshot::capture(&store, 42, &exec);
+    s2.write(&snap_path).expect("overwrite");
+    let loaded = Snapshot::load(&snap_path).unwrap().unwrap();
+    assert_eq!(loaded.seq, 42, "second write must replace the first");
+    assert!(loaded.records.contains_key("Caja"));
+
+    // No leftover tempfile.
+    let writing_path = snap_path.with_extension("writing");
+    assert!(
+        !writing_path.exists(),
+        "tempfile must be renamed, not left behind"
+    );
+
+    let _ = std::fs::remove_file(&snap_path);
+}
+
+#[test]
+fn snapshot_write_recovers_from_stale_tempfile() {
+    // A prior write crashed after creating .writing but before rename.
+    // The next write must succeed regardless — File::create truncates
+    // the stale tempfile.
+    let snap_path = fresh_snap_path();
+    let writing_path = snap_path.with_extension("writing");
+
+    // Plant a stale tempfile with garbage content.
+    std::fs::write(&writing_path, b"junk from a prior crashed write").unwrap();
+    assert!(writing_path.exists());
+
+    let exec = Executor::load_module(treasury_module()).expect("load");
+    let snap = Snapshot::capture(&MemoryStore::new(), 0, &exec);
+    snap.write(&snap_path).expect("write despite stale tempfile");
+
+    // Tempfile should be renamed (not orphaned), so it's gone.
+    assert!(
+        !writing_path.exists(),
+        "stale tempfile must be consumed by the rename"
+    );
+    let loaded = Snapshot::load(&snap_path).unwrap().unwrap();
+    assert_eq!(loaded.seq, 0);
+
+    let _ = std::fs::remove_file(&snap_path);
+}
+
+// === helpers shared with the run-server protocol tests ===
+
+struct Conn {
+    writer: UnixStream,
+    reader: BufReader<UnixStream>,
+}
+
+fn connect_with_retry(path: &Path) -> Conn {
+    for _ in 0..200 {
+        if let Ok(stream) = UnixStream::connect(path) {
+            let reader_stream = stream.try_clone().expect("clone");
+            return Conn {
+                writer: stream,
+                reader: BufReader::new(reader_stream),
+            };
+        }
+        thread::sleep(Duration::from_millis(20));
+    }
+    panic!("server never started accepting on {}", path.display());
+}
+
+fn exchange(conn: &mut Conn, req: Value) -> Value {
+    let mut bytes = serde_json::to_vec(&req).unwrap();
+    bytes.push(b'\n');
+    conn.writer.write_all(&bytes).unwrap();
+    let mut line = String::new();
+    conn.reader.read_line(&mut line).unwrap();
+    serde_json::from_str(line.trim()).unwrap()
+}
+
+fn send_shutdown(conn: &mut Conn) {
+    let _ = exchange(conn, json!({"op": "shutdown"}));
+}
diff --git a/crates/modules/nakui/core/tests/state_hash.rs b/crates/modules/nakui/core/tests/state_hash.rs
new file mode 100644
index 0000000..19a3566
--- /dev/null
+++ b/crates/modules/nakui/core/tests/state_hash.rs
@@ -0,0 +1,159 @@
+//! Tests for the `Store::iter` / `Store::hash_state` contract under
+//! realistic WAL flows: a live store and a log-replayed store must hash
+//! identically, drift must be detectable as a hash mismatch, and the
+//! property must hold across backends (within a backend — cross-backend
+//! parity is a separate concern, see notes below).
+
+use std::path::{Path, PathBuf};
+
+use nakui_core::event_log::{EventLog, execute_and_log, replay, seed_and_log};
+use nakui_core::executor::Executor;
+use nakui_core::store::{MemoryStore, Store};
+use serde_json::json;
+use uuid::Uuid;
+
+fn workspace_root() -> PathBuf {
+    Path::new(env!("CARGO_MANIFEST_DIR"))
+        .parent()
+        .expect("workspace root above core/")
+        .to_path_buf()
+}
+
+fn treasury_module() -> PathBuf {
+    workspace_root().join("modules/treasury")
+}
+
+fn fresh_log_path() -> PathBuf {
+    std::env::temp_dir().join(format!("nakui_hash_{}.jsonl", Uuid::new_v4()))
+}
+
+fn seed_two_cajas(
+    exec: &Executor,
+    store: &mut MemoryStore,
+    log: &mut EventLog,
+    a: Uuid,
+    b: Uuid,
+) {
+    seed_and_log(
+        exec,
+        store,
+        log,
+        "Caja",
+        a,
+        json!({"id": a.to_string(), "name": "A", "saldo": 200_000_i64, "currency": "USD"}),
+    )
+    .unwrap();
+    seed_and_log(
+        exec,
+        store,
+        log,
+        "Caja",
+        b,
+        json!({"id": b.to_string(), "name": "B", "saldo": 50_000_i64, "currency": "USD"}),
+    )
+    .unwrap();
+}
+
+#[test]
+fn live_store_hash_matches_replayed_store_hash() {
+    let exec = Executor::load_module(treasury_module()).expect("load");
+    let log_path = fresh_log_path();
+    let mut log = EventLog::open(&log_path).unwrap();
+    let mut live = MemoryStore::new();
+
+    let a = Uuid::new_v4();
+    let b = Uuid::new_v4();
+    seed_two_cajas(&exec, &mut live, &mut log, a, b);
+
+    execute_and_log(
+        &exec,
+        &mut live,
+        &mut log,
+        "register_cash_move",
+        &[("caja", a)],
+        json!({
+            "monto": 25_000_i64,
+            "tipo": "in",
+            "timestamp": "2026-05-04T10:00:00Z",
+            "memo": "x",
+            "movimiento_id": Uuid::new_v4().to_string(),
+        }),
+    )
+    .unwrap();
+    execute_and_log(
+        &exec,
+        &mut live,
+        &mut log,
+        "transfer_between_cajas",
+        &[("source", a), ("dest", b)],
+        json!({
+            "monto": 75_000_i64,
+            "timestamp": "2026-05-04T10:30:00Z",
+            "memo": "xf",
+            "transfer_id": Uuid::new_v4().to_string(),
+        }),
+    )
+    .unwrap();
+
+    let replayed = replay(&log).expect("replay");
+
+    assert_eq!(
+        live.hash_state().unwrap(),
+        replayed.hash_state().unwrap(),
+        "live and replayed stores must hash identically"
+    );
+
+    let _ = std::fs::remove_file(&log_path);
+}
+
+#[test]
+fn drift_is_detectable_via_hash_diff() {
+    let exec = Executor::load_module(treasury_module()).expect("load");
+    let log_path = fresh_log_path();
+    let mut log = EventLog::open(&log_path).unwrap();
+    let mut live = MemoryStore::new();
+
+    let a = Uuid::new_v4();
+    let b = Uuid::new_v4();
+    seed_two_cajas(&exec, &mut live, &mut log, a, b);
+
+    let baseline = live.hash_state().unwrap();
+    let replayed_baseline = replay(&log).unwrap().hash_state().unwrap();
+    assert_eq!(baseline, replayed_baseline);
+
+    // Drift the live store out-of-band — exactly what the drift detector
+    // is meant to catch.
+    live.seed(
+        "Caja",
+        a,
+        json!({"id": a.to_string(), "name": "A", "saldo": 999_999_i64, "currency": "USD"}),
+    );
+
+    let drifted = live.hash_state().unwrap();
+    let log_canonical = replay(&log).unwrap().hash_state().unwrap();
+    assert_ne!(
+        drifted, log_canonical,
+        "the whole point of hash_state: this comparison must surface the drift"
+    );
+
+    let _ = std::fs::remove_file(&log_path);
+}
+
+#[test]
+fn hash_state_is_stable_across_repeated_calls() {
+    // The hash must not drift just because we asked for it twice.
+    // Sounds obvious; protects against an iteration order that depends
+    // on a HashMap's per-process random seed sneaking past the sort.
+    let mut store = MemoryStore::new();
+    for _ in 0..10 {
+        let id = Uuid::new_v4();
+        store.seed(
+            "Caja",
+            id,
+            json!({"id": id.to_string(), "saldo": 100_i64, "currency": "USD"}),
+        );
+    }
+    let h1 = store.hash_state().unwrap();
+    let h2 = store.hash_state().unwrap();
+    assert_eq!(h1, h2, "hash must be a function of state, not call order");
+}
diff --git a/crates/modules/nakui/core/tests/surreal_persist.rs b/crates/modules/nakui/core/tests/surreal_persist.rs
new file mode 100644
index 0000000..3963b1a
--- /dev/null
+++ b/crates/modules/nakui/core/tests/surreal_persist.rs
@@ -0,0 +1,97 @@
+//! Persistence test for SurrealStore against the RocksDB backend.
+//!
+//! Gated behind the `persistent` Cargo feature because RocksDB is a heavy
+//! native dep (~5 min to compile cold). Run with:
+//!     cargo test --features persistent --test surreal_persist
+
+#![cfg(feature = "persistent")]
+
+use std::path::PathBuf;
+
+use nakui_core::store::Store;
+use nakui_core::surreal_store::SurrealStore;
+use serde_json::{Value, json};
+use uuid::Uuid;
+
+fn fresh_db_path() -> PathBuf {
+    std::env::temp_dir().join(format!("nakui_persist_{}", Uuid::new_v4()))
+}
+
+#[test]
+fn data_survives_close_and_reopen() {
+    let path = fresh_db_path();
+    let id = Uuid::new_v4();
+
+    {
+        let mut store = SurrealStore::new_persistent(&path).expect("open persistent");
+        store.seed(
+            "Caja",
+            id,
+            json!({
+                "id": id.to_string(),
+                "name": "persisted",
+                "saldo": 12_345_i64,
+                "currency": "USD",
+            }),
+        );
+        // Drop store; runtime + db released.
+    }
+
+    {
+        let store = SurrealStore::new_persistent(&path).expect("reopen persistent");
+        let loaded = store
+            .load("Caja", id)
+            .expect("record must survive reopen");
+        assert_eq!(
+            loaded.get("saldo").and_then(Value::as_i64),
+            Some(12_345),
+            "saldo persisted"
+        );
+        assert_eq!(
+            loaded.get("currency").and_then(Value::as_str),
+            Some("USD"),
+            "currency persisted"
+        );
+    }
+
+    let _ = std::fs::remove_dir_all(&path);
+}
+
+#[test]
+fn applied_ops_persist_across_reopens() {
+    use nakui_core::delta::{FieldOp, FieldPath};
+
+    let path = fresh_db_path();
+    let id = Uuid::new_v4();
+
+    {
+        let mut store = SurrealStore::new_persistent(&path).expect("open");
+        store.seed(
+            "Caja",
+            id,
+            json!({"id": id.to_string(), "saldo": 100_i64, "currency": "USD"}),
+        );
+        store
+            .apply(&[FieldOp::Set {
+                path: FieldPath {
+                    entity: "Caja".into(),
+                    id,
+                    field: "saldo".into(),
+                },
+                value: json!(999_i64),
+            }])
+            .expect("apply Set");
+    }
+
+    {
+        let store = SurrealStore::new_persistent(&path).expect("reopen");
+        let v = store.load("Caja", id).expect("present");
+        assert_eq!(
+            v.get("saldo").and_then(Value::as_i64),
+            Some(999),
+            "Set op persisted across restart"
+        );
+    }
+
+    let _ = std::fs::remove_dir_all(&path);
+}
diff --git a/crates/modules/nakui/core/tests/surreal_store.rs b/crates/modules/nakui/core/tests/surreal_store.rs
new file mode 100644
index 0000000..da12b88
--- /dev/null
+++ b/crates/modules/nakui/core/tests/surreal_store.rs
@@ -0,0 +1,537 @@
+//! SurrealStore: kv-mem SurrealDB behind the same `Store` trait.
+//!
+//! Tests confirm: round-trip persistence preserving the application-level
+//! `id` field, the dry-run contract, and the full WAL flow against the
+//! real DB driver — execute_and_log → replay_into → live equals replayed.
+
+use std::path::{Path, PathBuf};
+
+use nakui_core::delta::{FieldOp, FieldPath};
+use nakui_core::event_log::{
+    EventLog, execute_and_log, reconcile, replay_into, seed_and_log, verify_log,
+};
+use nakui_core::executor::Executor;
+use nakui_core::store::{MemoryStore, Store, StoreError};
+use nakui_core::surreal_store::SurrealStore;
+use serde_json::{Value, json};
+use uuid::Uuid;
+
+fn workspace_root() -> PathBuf {
+    Path::new(env!("CARGO_MANIFEST_DIR"))
+        .parent()
+        .expect("workspace root above core/")
+        .to_path_buf()
+}
+
+fn treasury_module() -> PathBuf {
+    workspace_root().join("modules/treasury")
+}
+
+fn fresh_log_path() -> PathBuf {
+    std::env::temp_dir().join(format!("nakui_surreal_{}.jsonl", Uuid::new_v4()))
+}
+
+fn caja_data(id: Uuid, saldo: i64, currency: &str) -> Value {
+    json!({
+        "id": id.to_string(),
+        "name": "Caja",
+        "saldo": saldo,
+        "currency": currency,
+    })
+}
+
+#[test]
+fn seed_then_load_preserves_application_id() {
+    let mut store = SurrealStore::new_in_memory().expect("surreal");
+    let id = Uuid::new_v4();
+    store.seed("Caja", id, caja_data(id, 100_000, "USD"));
+
+    let loaded = store.load("Caja", id).expect("loaded");
+    assert_eq!(
+        loaded.get("id").and_then(Value::as_str),
+        Some(id.to_string().as_str()),
+        "load must restore the application-level id field"
+    );
+    assert_eq!(loaded.get("saldo").and_then(Value::as_i64), Some(100_000));
+    assert_eq!(loaded.get("currency").and_then(Value::as_str), Some("USD"));
+}
+
+#[test]
+fn apply_set_updates_field() {
+    let mut store = SurrealStore::new_in_memory().expect("surreal");
+    let id = Uuid::new_v4();
+    store.seed("Caja", id, caja_data(id, 100_000, "USD"));
+
+    store
+        .apply(&[FieldOp::Set {
+            path: FieldPath {
+                entity: "Caja".into(),
+                id,
+                field: "saldo".into(),
+            },
+            value: json!(250_000_i64),
+        }])
+        .expect("apply Set");
+
+    let loaded = store.load("Caja", id).expect("loaded");
+    assert_eq!(loaded.get("saldo").and_then(Value::as_i64), Some(250_000));
+    // Other fields preserved.
+    assert_eq!(loaded.get("currency").and_then(Value::as_str), Some("USD"));
+}
+
+#[test]
+fn apply_create_persists_record() {
+    let mut store = SurrealStore::new_in_memory().expect("surreal");
+    let id = Uuid::new_v4();
+    store
+        .apply(&[FieldOp::Create {
+            entity: "Movimiento".into(),
+            id,
+            data: json!({
+                "id": id.to_string(),
+                "caja_id": Uuid::new_v4().to_string(),
+                "monto": 1000,
+                "tipo": "in",
+                "timestamp": "2026-05-04T00:00:00Z",
+            }),
+        }])
+        .expect("apply Create");
+
+    let loaded = store.load("Movimiento", id).expect("loaded");
+    assert_eq!(loaded.get("monto").and_then(Value::as_i64), Some(1000));
+    assert_eq!(loaded.get("tipo").and_then(Value::as_str), Some("in"));
+}
+
+#[test]
+fn apply_delete_removes_record() {
+    let mut store = SurrealStore::new_in_memory().expect("surreal");
+    let id = Uuid::new_v4();
+    store.seed("Caja", id, caja_data(id, 100_000, "USD"));
+
+    store
+        .apply(&[FieldOp::Delete {
+            entity: "Caja".into(),
+            id,
+        }])
+        .expect("apply Delete");
+
+    assert!(store.load("Caja", id).is_none());
+}
+
+#[test]
+fn dry_run_rejects_create_conflict() {
+    let mut store = SurrealStore::new_in_memory().expect("surreal");
+    let id = Uuid::new_v4();
+    store.seed("Caja", id, caja_data(id, 100, "USD"));
+
+    let result = store.apply_dry_run(&[FieldOp::Create {
+        entity: "Caja".into(),
+        id,
+        data: json!({"id": id.to_string()}),
+    }]);
+    assert!(matches!(result, Err(StoreError::Conflict(_, _))));
+}
+
+#[test]
+fn dry_run_rejects_set_not_found() {
+    let store = SurrealStore::new_in_memory().expect("surreal");
+    let id = Uuid::new_v4();
+    let result = store.apply_dry_run(&[FieldOp::Set {
+        path: FieldPath {
+            entity: "Caja".into(),
+            id,
+            field: "saldo".into(),
+        },
+        value: json!(0),
+    }]);
+    assert!(matches!(result, Err(StoreError::NotFound(_, _))));
+}
+
+#[test]
+fn full_wal_flow_against_surreal() {
+    let exec = Executor::load_module(treasury_module()).expect("load module");
+    let log_path = fresh_log_path();
+    let mut log = EventLog::open(&log_path).expect("open log");
+    let mut live = SurrealStore::new_in_memory().expect("live store");
+
+    let a = Uuid::new_v4();
+    let b = Uuid::new_v4();
+    seed_and_log(
+        &exec,
+        &mut live,
+        &mut log,
+        "Caja",
+        a,
+        caja_data(a, 200_000, "USD"),
+    )
+    .expect("seed A");
+    seed_and_log(
+        &exec,
+        &mut live,
+        &mut log,
+        "Caja",
+        b,
+        caja_data(b, 50_000, "USD"),
+    )
+    .expect("seed B");
+
+    execute_and_log(
+        &exec,
+        &mut live,
+        &mut log,
+        "register_cash_move",
+        &[("caja", a)],
+        json!({
+            "monto": 25_000_i64,
+            "tipo": "in",
+            "timestamp": "2026-05-04T10:00:00Z",
+            "memo": "test",
+            "movimiento_id": Uuid::new_v4().to_string(),
+        }),
+    )
+    .expect("deposit ok");
+
+    execute_and_log(
+        &exec,
+        &mut live,
+        &mut log,
+        "transfer_between_cajas",
+        &[("source", a), ("dest", b)],
+        json!({
+            "monto": 75_000_i64,
+            "timestamp": "2026-05-04T10:30:00Z",
+            "memo": "xfer",
+            "transfer_id": Uuid::new_v4().to_string(),
+        }),
+    )
+    .expect("transfer ok");
+
+    // Replay into a fresh SurrealStore and confirm field-by-field that
+    // saldos and entity counts match the live one.
+    let mut replayed = SurrealStore::new_in_memory().expect("replay store");
+    replay_into(&log, &mut replayed).expect("replay");
+
+    let live_a = live.load("Caja", a).expect("live A");
+    let replayed_a = replayed.load("Caja", a).expect("replayed A");
+    assert_eq!(
+        live_a.get("saldo").and_then(Value::as_i64),
+        replayed_a.get("saldo").and_then(Value::as_i64)
+    );
+
+    let live_b = live.load("Caja", b).expect("live B");
+    let replayed_b = replayed.load("Caja", b).expect("replayed B");
+    assert_eq!(
+        live_b.get("saldo").and_then(Value::as_i64),
+        replayed_b.get("saldo").and_then(Value::as_i64)
+    );
+
+    assert_eq!(live_a.get("saldo").and_then(Value::as_i64), Some(150_000));
+    assert_eq!(live_b.get("saldo").and_then(Value::as_i64), Some(125_000));
+
+    let _ = std::fs::remove_file(&log_path);
+}
+
+#[test]
+fn verify_log_against_surreal_passes() {
+    let exec = Executor::load_module(treasury_module()).expect("load module");
+    let log_path = fresh_log_path();
+    let mut log = EventLog::open(&log_path).expect("open log");
+    let mut live = SurrealStore::new_in_memory().expect("live");
+
+    let a = Uuid::new_v4();
+    let b = Uuid::new_v4();
+    seed_and_log(&exec, &mut live, &mut log, "Caja", a, caja_data(a, 200_000, "USD")).unwrap();
+    seed_and_log(&exec, &mut live, &mut log, "Caja", b, caja_data(b, 50_000, "USD")).unwrap();
+    execute_and_log(
+        &exec,
+        &mut live,
+        &mut log,
+        "transfer_between_cajas",
+        &[("source", a), ("dest", b)],
+        json!({
+            "monto": 25_000_i64,
+            "timestamp": "2026-05-04T11:00:00Z",
+            "memo": "v",
+            "transfer_id": Uuid::new_v4().to_string(),
+        }),
+    )
+    .unwrap();
+
+    // verify_log internally creates its own MemoryStore for re-execution;
+    // even though `live` is SurrealStore, the determinism check is
+    // re-running each morphism through the kernel and comparing ops, so
+    // the verification store backend doesn't need to match the live one.
+    verify_log(&log, &exec).expect("re-execution must produce identical ops");
+
+    let _ = std::fs::remove_file(&log_path);
+}
+
+#[test]
+fn replay_into_memorystore_from_surreal_run_log() {
+    // Ensure logs produced by SurrealStore-backed runs replay correctly
+    // into a *different* backend (MemoryStore). The log is the source of
+    // truth — backend choice shouldn't change the replay result.
+    let exec = Executor::load_module(treasury_module()).expect("load");
+    let log_path = fresh_log_path();
+    let mut log = EventLog::open(&log_path).expect("open");
+
+    let mut surreal_live = SurrealStore::new_in_memory().expect("surreal");
+    let a = Uuid::new_v4();
+    seed_and_log(
+        &exec,
+        &mut surreal_live,
+        &mut log,
+        "Caja",
+        a,
+        caja_data(a, 100_000, "USD"),
+    )
+    .unwrap();
+    execute_and_log(
+        &exec,
+        &mut surreal_live,
+        &mut log,
+        "register_cash_move",
+        &[("caja", a)],
+        json!({
+            "monto": 50_000_i64,
+            "tipo": "in",
+            "timestamp": "2026-05-04T08:00:00Z",
+            "memo": "x",
+            "movimiento_id": Uuid::new_v4().to_string(),
+        }),
+    )
+    .unwrap();
+
+    let mut mem_replay = MemoryStore::new();
+    replay_into(&log, &mut mem_replay).expect("replay");
+
+    let live_saldo = surreal_live
+        .load("Caja", a)
+        .and_then(|v| v.get("saldo").and_then(Value::as_i64))
+        .unwrap();
+    let replay_saldo = mem_replay
+        .load("Caja", a)
+        .and_then(|v| v.get("saldo").and_then(Value::as_i64))
+        .unwrap();
+    assert_eq!(live_saldo, replay_saldo);
+    assert_eq!(live_saldo, 150_000);
+
+    let _ = std::fs::remove_file(&log_path);
+}
+
+#[test]
+fn clear_drops_all_records_across_tables() {
+    let mut store = SurrealStore::new_in_memory().expect("surreal");
+    let caja_id = Uuid::new_v4();
+    let mov_id = Uuid::new_v4();
+    store.seed("Caja", caja_id, caja_data(caja_id, 100_000, "USD"));
+    store.seed(
+        "Movimiento",
+        mov_id,
+        json!({
+            "id": mov_id.to_string(),
+            "caja_id": caja_id.to_string(),
+            "monto": 1_000,
+            "tipo": "in",
+            "timestamp": "2026-05-04T00:00:00Z",
+        }),
+    );
+    assert!(store.load("Caja", caja_id).is_some());
+    assert!(store.load("Movimiento", mov_id).is_some());
+
+    store.clear().expect("clear");
+
+    assert!(
+        store.load("Caja", caja_id).is_none(),
+        "clear must drop records from every table"
+    );
+    assert!(store.load("Movimiento", mov_id).is_none());
+
+    // Store is reusable after clear — seed a new record and load it back.
+    let fresh = Uuid::new_v4();
+    store.seed("Caja", fresh, caja_data(fresh, 1, "USD"));
+    assert!(store.load("Caja", fresh).is_some());
+}
+
+#[test]
+fn cross_backend_hash_equals_for_equivalent_data() {
+    // The whole point of the canonical Value hasher: a SurrealStore
+    // and a MemoryStore that hold the same logical records must hash
+    // identically. Same WAL log replayed into each backend ⇒
+    // hash_state produces byte-equal output.
+    let exec = Executor::load_module(treasury_module()).expect("load module");
+    let log_path = fresh_log_path();
+    let mut log = EventLog::open(&log_path).expect("open log");
+
+    let mut surreal = SurrealStore::new_in_memory().expect("surreal");
+    let mut memory = MemoryStore::new();
+
+    let a = Uuid::new_v4();
+    let b = Uuid::new_v4();
+    // Seed both backends through the WAL so they go through identical
+    // op sequences. We seed each backend separately because seed_and_log
+    // takes one store at a time.
+    seed_and_log(
+        &exec,
+        &mut surreal,
+        &mut log,
+        "Caja",
+        a,
+        caja_data(a, 200_000, "USD"),
+    )
+    .unwrap();
+    seed_and_log(
+        &exec,
+        &mut surreal,
+        &mut log,
+        "Caja",
+        b,
+        caja_data(b, 50_000, "USD"),
+    )
+    .unwrap();
+    execute_and_log(
+        &exec,
+        &mut surreal,
+        &mut log,
+        "register_cash_move",
+        &[("caja", a)],
+        json!({
+            "monto": 1_000_i64,
+            "tipo": "in",
+            "timestamp": "2026-05-04T08:00:00Z",
+            "memo": "x",
+            "movimiento_id": Uuid::new_v4().to_string(),
+        }),
+    )
+    .unwrap();
+
+    // Replay that same log into a fresh MemoryStore.
+    nakui_core::event_log::replay_into(&log, &mut memory).expect("replay");
+
+    let h_surreal = surreal.hash_state().expect("surreal hash");
+    let h_memory = memory.hash_state().expect("memory hash");
+    assert_eq!(
+        h_surreal, h_memory,
+        "MemoryStore and SurrealStore must hash identically for the same WAL state"
+    );
+
+    let _ = std::fs::remove_file(&log_path);
+}
+
+#[test]
+fn iter_and_hash_state_round_trip_against_surreal() {
+    // Build the same WAL flow against two independent SurrealStores.
+    // Each store reaches the same logical state via a different path
+    // (one via execute_and_log, the other via replay_into) and they
+    // must hash identically — that's the contract drift detection
+    // sits on top of.
+    let exec = Executor::load_module(treasury_module()).expect("load module");
+    let log_path = fresh_log_path();
+    let mut log = EventLog::open(&log_path).expect("open log");
+
+    let mut live = SurrealStore::new_in_memory().expect("live");
+    let a = Uuid::new_v4();
+    let b = Uuid::new_v4();
+    seed_and_log(&exec, &mut live, &mut log, "Caja", a, caja_data(a, 200_000, "USD")).unwrap();
+    seed_and_log(&exec, &mut live, &mut log, "Caja", b, caja_data(b, 50_000, "USD")).unwrap();
+    execute_and_log(
+        &exec,
+        &mut live,
+        &mut log,
+        "register_cash_move",
+        &[("caja", a)],
+        json!({
+            "monto": 1_000_i64,
+            "tipo": "in",
+            "timestamp": "2026-05-04T08:00:00Z",
+            "memo": "x",
+            "movimiento_id": Uuid::new_v4().to_string(),
+        }),
+    )
+    .unwrap();
+
+    // iter must enumerate every record.
+    let recs: Vec<_> = live.iter().expect("iter").collect();
+    let by_entity: std::collections::HashMap<&str, usize> =
+        recs.iter().fold(std::collections::HashMap::new(), |mut m, (e, _, _)| {
+            *m.entry(e.as_str()).or_insert(0) += 1;
+            m
+        });
+    assert_eq!(by_entity.get("Caja").copied(), Some(2), "two Cajas");
+    assert_eq!(by_entity.get("Movimiento").copied(), Some(1), "one Movimiento");
+
+    // canonical order: entities sorted, ids byte-sorted within entity.
+    let entities: Vec<&str> = recs.iter().map(|(e, _, _)| e.as_str()).collect();
+    assert!(
+        entities.windows(2).all(|w| w[0] <= w[1]),
+        "entities must be sorted: {:?}",
+        entities
+    );
+
+    // Replay the log into a fresh SurrealStore — same hash.
+    let mut replayed = SurrealStore::new_in_memory().expect("replay store");
+    replay_into(&log, &mut replayed).expect("replay");
+    assert_eq!(
+        live.hash_state().unwrap(),
+        replayed.hash_state().unwrap(),
+        "live and replayed SurrealStores must hash identically"
+    );
+
+    // Drift detection: tamper one saldo and confirm the hash diverges.
+    live.seed("Caja", a, caja_data(a, 999_999, "USD"));
+    assert_ne!(
+        live.hash_state().unwrap(),
+        replayed.hash_state().unwrap(),
+        "out-of-band saldo change must show up as a hash mismatch"
+    );
+
+    let _ = std::fs::remove_file(&log_path);
+}
+
+#[test]
+fn reconcile_rebuilds_drifted_surreal_store_from_log() {
+    let exec = Executor::load_module(treasury_module()).expect("load module");
+    let log_path = fresh_log_path();
+    let mut log = EventLog::open(&log_path).expect("open log");
+    let mut store = SurrealStore::new_in_memory().expect("surreal");
+
+    let a = Uuid::new_v4();
+    seed_and_log(&exec, &mut store, &mut log, "Caja", a, caja_data(a, 100_000, "USD")).unwrap();
+    execute_and_log(
+        &exec,
+        &mut store,
+        &mut log,
+        "register_cash_move",
+        &[("caja", a)],
+        json!({
+            "monto": 5_000_i64,
+            "tipo": "in",
+            "timestamp": "2026-05-04T10:00:00Z",
+            "memo": "x",
+            "movimiento_id": Uuid::new_v4().to_string(),
+        }),
+    )
+    .unwrap();
+
+    // Drift: a poison record nobody logged + an out-of-band saldo bump.
+    let ghost = Uuid::new_v4();
+    store.seed("Caja", ghost, caja_data(ghost, 0, "USD"));
+    store.seed("Caja", a, caja_data(a, 999_999, "USD"));
+    assert_eq!(
+        store.load("Caja", a).and_then(|v| v.get("saldo").and_then(Value::as_i64)),
+        Some(999_999),
+        "drift was applied"
+    );
+
+    reconcile(&mut store, &log).expect("reconcile");
+
+    // After reconcile: ghost gone, saldo = 100_000 (seed) + 5_000 (deposit).
+    assert!(store.load("Caja", ghost).is_none(), "poison record wiped");
+    assert_eq!(
+        store.load("Caja", a).and_then(|v| v.get("saldo").and_then(Value::as_i64)),
+        Some(105_000),
+        "reconcile must restore log-canonical saldo"
+    );
+
+    let _ = std::fs::remove_file(&log_path);
+}
diff --git a/crates/modules/nakui/modules/inventory/morphisms/recibir_stock.rhai b/crates/modules/nakui/modules/inventory/morphisms/recibir_stock.rhai
new file mode 100644
index 0000000..d51e96b
--- /dev/null
+++ b/crates/modules/nakui/modules/inventory/morphisms/recibir_stock.rhai
@@ -0,0 +1,36 @@
+// recibir_stock
+// Inflow: external supplier delivers `cantidad` units into a Stock record.
+// NOT conservation-bound: the units enter the system from outside.
+//
+// states.stock: the current Stock record.
+// ids.stock:    its UUID (string).
+// params:       { cantidad:i64, timestamp:str, movimiento_id:str }
+
+let cantidad = input.params.cantidad;
+if cantidad <= 0 {
+    throw "cantidad debe ser positiva (la dirección la fija el morfismo)"
+}
+let mov_id = input.params.movimiento_id;
+if type_of(mov_id) == "()" {
+    throw "params.movimiento_id es obligatorio (idempotencia)"
+}
+
+[
+    #{
+        op: "set",
+        path: #{ entity: "Stock", id: input.ids.stock, field: "cantidad" },
+        value: input.states.stock.cantidad + cantidad,
+    },
+    #{
+        op: "create",
+        entity: "MovimientoStock",
+        id: mov_id,
+        data: #{
+            id:        mov_id,
+            stock_id:  input.ids.stock,
+            delta:     cantidad,
+            razon:     "recepcion",
+            timestamp: input.params.timestamp,
+        },
+    },
+]
diff --git a/crates/modules/nakui/modules/inventory/morphisms/transferir_stock.rhai b/crates/modules/nakui/modules/inventory/morphisms/transferir_stock.rhai
new file mode 100644
index 0000000..6d13266
--- /dev/null
+++ b/crates/modules/nakui/modules/inventory/morphisms/transferir_stock.rhai
@@ -0,0 +1,50 @@
+// transferir_stock
+// Two-input morphism. Conservation rule (Stock.cantidad grouped by sku_id)
+// is enforced by the kernel against the produced ops. Same-SKU is also
+// asserted in-script for an explicit error message; without that check
+// the kernel would still catch the violation via per-sku grouping.
+//
+// states.source / states.dest: the two Stock records.
+// ids.source / ids.dest:       their UUIDs.
+// params: { cantidad:i64, timestamp:str, transfer_id:str }
+
+let cantidad = input.params.cantidad;
+let source = input.states.source;
+let dest   = input.states.dest;
+
+if cantidad <= 0 {
+    throw "cantidad debe ser positiva"
+}
+if source.sku_id != dest.sku_id {
+    throw "transferencia exige mismo SKU; source=" + source.sku_id + " dest=" + dest.sku_id
+}
+let xfr_id = input.params.transfer_id;
+if type_of(xfr_id) == "()" {
+    throw "params.transfer_id es obligatorio (idempotencia)"
+}
+
+[
+    #{
+        op: "set",
+        path: #{ entity: "Stock", id: input.ids.source, field: "cantidad" },
+        value: source.cantidad - cantidad,
+    },
+    #{
+        op: "set",
+        path: #{ entity: "Stock", id: input.ids.dest, field: "cantidad" },
+        value: dest.cantidad + cantidad,
+    },
+    #{
+        op: "create",
+        entity: "TransferenciaStock",
+        id: xfr_id,
+        data: #{
+            id:              xfr_id,
+            source_stock_id: input.ids.source,
+            dest_stock_id:   input.ids.dest,
+            sku_id:          source.sku_id,
+            cantidad:        cantidad,
+            timestamp:       input.params.timestamp,
+        },
+    },
+]
diff --git a/crates/modules/nakui/modules/inventory/nsmc.json b/crates/modules/nakui/modules/inventory/nsmc.json
new file mode 100644
index 0000000..6971f19
--- /dev/null
+++ b/crates/modules/nakui/modules/inventory/nsmc.json
@@ -0,0 +1,31 @@
+{
+  "module": "inventory",
+  "morphisms": [
+    {
+      "name": "recibir_stock",
+      "inputs": [
+        { "role": "stock", "entity": "Stock" }
+      ],
+      "reads":  ["stock.cantidad", "stock.sku_id"],
+      "writes": ["stock.cantidad", "MovimientoStock"],
+      "depends_on": [],
+      "script": "morphisms/recibir_stock.rhai"
+    },
+    {
+      "name": "transferir_stock",
+      "inputs": [
+        { "role": "source", "entity": "Stock" },
+        { "role": "dest",   "entity": "Stock" }
+      ],
+      "reads":  ["source.cantidad", "source.sku_id", "dest.cantidad", "dest.sku_id"],
+      "writes": ["source.cantidad", "dest.cantidad", "TransferenciaStock"],
+      "invariants": {
+        "conserve": [
+          { "entity": "Stock", "field": "cantidad", "group_by": "sku_id" }
+        ]
+      },
+      "depends_on": [],
+      "script": "morphisms/transferir_stock.rhai"
+    }
+  ]
+}
diff --git a/crates/modules/nakui/modules/inventory/schema.k b/crates/modules/nakui/modules/inventory/schema.k
new file mode 100644
index 0000000..0dbf2c7
--- /dev/null
+++ b/crates/modules/nakui/modules/inventory/schema.k
@@ -0,0 +1,34 @@
+schema Stock:
+    id: str
+    sku_id: str
+    ubicacion: str
+    cantidad: int
+
+    check:
+        cantidad >= 0, "stock no puede ser negativo"
+        len(ubicacion) > 0, "ubicacion requerida"
+        len(sku_id) > 0, "sku_id requerido"
+
+schema MovimientoStock:
+    id: str
+    stock_id: str
+    delta: int
+    razon: str
+    timestamp: str
+
+    check:
+        razon in ["recepcion", "despacho", "ajuste"], "razon invalida"
+        delta != 0, "delta no puede ser cero"
+
+schema TransferenciaStock:
+    id: str
+    source_stock_id: str
+    dest_stock_id: str
+    sku_id: str
+    cantidad: int
+    timestamp: str
+
+    check:
+        cantidad > 0, "cantidad debe ser positiva"
+        source_stock_id != dest_stock_id, "source y dest no pueden ser el mismo stock"
+        len(sku_id) > 0, "sku_id requerido"
diff --git a/crates/modules/nakui/modules/sales/morphisms/vender.rhai b/crates/modules/nakui/modules/sales/morphisms/vender.rhai
new file mode 100644
index 0000000..eb09819
--- /dev/null
+++ b/crates/modules/nakui/modules/sales/morphisms/vender.rhai
@@ -0,0 +1,52 @@
+// vender
+// Cross-module morphism: decreases Stock (inventory) and increases Caja
+// (treasury). NOT conservation-bound — a sale is asymmetric: units leave
+// the system, money enters. The kernel validates each entity against its
+// own schema (Stock from inventory, Caja from treasury, Venta from sales).
+//
+// states.stock: the Stock record (inventory module).
+// states.caja:  the Caja record (treasury module).
+// params: { cantidad:i64, precio_unitario:i64 (en centavos),
+//           timestamp:str, venta_id:str }
+
+let cantidad = input.params.cantidad;
+let precio   = input.params.precio_unitario;
+let venta_id = input.params.venta_id;
+
+if cantidad <= 0 { throw "cantidad debe ser positiva" }
+if precio   <= 0 { throw "precio_unitario debe ser positivo" }
+if type_of(venta_id) == "()" { throw "params.venta_id es obligatorio (idempotencia)" }
+
+let stock = input.states.stock;
+let caja  = input.states.caja;
+
+let total = cantidad * precio;
+
+[
+    #{
+        op: "set",
+        path: #{ entity: "Stock", id: input.ids.stock, field: "cantidad" },
+        value: stock.cantidad - cantidad,
+    },
+    #{
+        op: "set",
+        path: #{ entity: "Caja", id: input.ids.caja, field: "saldo" },
+        value: caja.saldo + total,
+    },
+    #{
+        op: "create",
+        entity: "Venta",
+        id: venta_id,
+        data: #{
+            id:              venta_id,
+            stock_id:        input.ids.stock,
+            caja_id:         input.ids.caja,
+            sku_id:          stock.sku_id,
+            cantidad:        cantidad,
+            precio_unitario: precio,
+            currency:        caja.currency,
+            total:           total,
+            timestamp:       input.params.timestamp,
+        },
+    },
+]
diff --git a/crates/modules/nakui/modules/sales/nsmc.json b/crates/modules/nakui/modules/sales/nsmc.json
new file mode 100644
index 0000000..438c476
--- /dev/null
+++ b/crates/modules/nakui/modules/sales/nsmc.json
@@ -0,0 +1,21 @@
+{
+  "module": "sales",
+  "schemas": [
+    "schema.k",
+    "../treasury/schema.k",
+    "../inventory/schema.k"
+  ],
+  "morphisms": [
+    {
+      "name": "vender",
+      "inputs": [
+        { "role": "stock", "entity": "Stock" },
+        { "role": "caja",  "entity": "Caja"  }
+      ],
+      "reads":  ["stock.cantidad", "stock.sku_id", "caja.saldo", "caja.currency"],
+      "writes": ["stock.cantidad", "caja.saldo", "Venta"],
+      "depends_on": [],
+      "script": "morphisms/vender.rhai"
+    }
+  ]
+}
diff --git a/crates/modules/nakui/modules/sales/schema.k b/crates/modules/nakui/modules/sales/schema.k
new file mode 100644
index 0000000..a55ccef
--- /dev/null
+++ b/crates/modules/nakui/modules/sales/schema.k
@@ -0,0 +1,16 @@
+schema Venta:
+    id: str
+    stock_id: str
+    caja_id: str
+    sku_id: str
+    cantidad: int
+    precio_unitario: int
+    currency: str
+    total: int
+    timestamp: str
+
+    check:
+        cantidad > 0, "cantidad positiva"
+        precio_unitario > 0, "precio_unitario positivo"
+        len(currency) == 3, "currency ISO 4217"
+        total == cantidad * precio_unitario, "total debe ser cantidad * precio_unitario"
diff --git a/crates/modules/nakui/modules/treasury/morphisms/register_cash_move.rhai b/crates/modules/nakui/modules/treasury/morphisms/register_cash_move.rhai
new file mode 100644
index 0000000..8ac42c0
--- /dev/null
+++ b/crates/modules/nakui/modules/treasury/morphisms/register_cash_move.rhai
@@ -0,0 +1,46 @@
+// register_cash_move
+// Pure transition. Receives `input` as { states, ids, params }; returns
+// an array of FieldOp objects. No clock, no random, no IO.
+//
+// states.caja: the current Caja record loaded from the store.
+// ids.caja:    the Caja's UUID (string form).
+// params:      { monto:i64, tipo:"in"|"out", timestamp:str, memo:str, movimiento_id:str }
+
+let saldo = input.states.caja.saldo;
+let monto = input.params.monto;
+let tipo  = input.params.tipo;
+let caja_id = input.ids.caja;
+
+let nuevo_saldo = if tipo == "in" {
+    saldo + monto
+} else if tipo == "out" {
+    saldo - monto
+} else {
+    throw "tipo desconocido: " + tipo
+};
+
+let mov_id = input.params.movimiento_id;
+if type_of(mov_id) == "()" {
+    throw "params.movimiento_id es obligatorio (idempotencia)"
+}
+
+[
+    #{
+        op: "set",
+        path: #{ entity: "Caja", id: caja_id, field: "saldo" },
+        value: nuevo_saldo,
+    },
+    #{
+        op: "create",
+        entity: "Movimiento",
+        id: mov_id,
+        data: #{
+            id: mov_id,
+            caja_id: caja_id,
+            monto: monto,
+            tipo: tipo,
+            timestamp: input.params.timestamp,
+            memo: input.params.memo,
+        },
+    },
+]
diff --git a/crates/modules/nakui/modules/treasury/morphisms/transfer_between_cajas.rhai b/crates/modules/nakui/modules/treasury/morphisms/transfer_between_cajas.rhai
new file mode 100644
index 0000000..3c71266
--- /dev/null
+++ b/crates/modules/nakui/modules/treasury/morphisms/transfer_between_cajas.rhai
@@ -0,0 +1,53 @@
+// transfer_between_cajas
+// Two-input morphism. Conservation rule (Caja.saldo grouped by currency)
+// is checked by the kernel against the produced ops; the script just emits
+// the deltas.
+//
+// states.source / states.dest: the two Caja records.
+// ids.source / ids.dest:       their UUIDs (string form).
+// params: { monto:i64, timestamp:str, memo:str, transfer_id:str }
+
+let source = input.states.source;
+let dest   = input.states.dest;
+let monto  = input.params.monto;
+
+if monto <= 0 {
+    throw "monto debe ser positivo"
+}
+if source.currency != dest.currency {
+    throw "transferencia exige misma moneda; source=" + source.currency + " dest=" + dest.currency
+}
+let transfer_id = input.params.transfer_id;
+if type_of(transfer_id) == "()" {
+    throw "params.transfer_id es obligatorio (idempotencia)"
+}
+
+let new_source_saldo = source.saldo - monto;
+let new_dest_saldo   = dest.saldo + monto;
+
+[
+    #{
+        op: "set",
+        path: #{ entity: "Caja", id: input.ids.source, field: "saldo" },
+        value: new_source_saldo,
+    },
+    #{
+        op: "set",
+        path: #{ entity: "Caja", id: input.ids.dest, field: "saldo" },
+        value: new_dest_saldo,
+    },
+    #{
+        op: "create",
+        entity: "Transferencia",
+        id: transfer_id,
+        data: #{
+            id: transfer_id,
+            source_caja_id: input.ids.source,
+            dest_caja_id:   input.ids.dest,
+            monto:          monto,
+            currency:       source.currency,
+            timestamp:      input.params.timestamp,
+            memo:           input.params.memo,
+        },
+    },
+]
diff --git a/crates/modules/nakui/modules/treasury/nsmc.json b/crates/modules/nakui/modules/treasury/nsmc.json
new file mode 100644
index 0000000..7fd67a4
--- /dev/null
+++ b/crates/modules/nakui/modules/treasury/nsmc.json
@@ -0,0 +1,31 @@
+{
+  "module": "treasury",
+  "morphisms": [
+    {
+      "name": "register_cash_move",
+      "inputs": [
+        { "role": "caja", "entity": "Caja" }
+      ],
+      "reads":  ["caja.saldo", "caja.currency"],
+      "writes": ["caja.saldo", "Movimiento"],
+      "depends_on": [],
+      "script": "morphisms/register_cash_move.rhai"
+    },
+    {
+      "name": "transfer_between_cajas",
+      "inputs": [
+        { "role": "source", "entity": "Caja" },
+        { "role": "dest",   "entity": "Caja" }
+      ],
+      "reads":  ["source.saldo", "source.currency", "dest.saldo", "dest.currency"],
+      "writes": ["source.saldo", "dest.saldo", "Transferencia"],
+      "invariants": {
+        "conserve": [
+          { "entity": "Caja", "field": "saldo", "group_by": "currency" }
+        ]
+      },
+      "depends_on": [],
+      "script": "morphisms/transfer_between_cajas.rhai"
+    }
+  ]
+}
diff --git a/crates/modules/nakui/modules/treasury/schema.k b/crates/modules/nakui/modules/treasury/schema.k
new file mode 100644
index 0000000..9f65ec6
--- /dev/null
+++ b/crates/modules/nakui/modules/treasury/schema.k
@@ -0,0 +1,35 @@
+schema Caja:
+    id: str
+    name: str
+    saldo: int
+    currency: str
+
+    check:
+        saldo >= 0, "saldo de caja no puede ser negativo"
+        len(currency) == 3, "currency debe ser ISO 4217 (3 letras)"
+
+schema Movimiento:
+    id: str
+    caja_id: str
+    monto: int
+    tipo: str
+    timestamp: str
+    memo?: str
+
+    check:
+        monto > 0, "monto debe ser positivo (la direccion la fija el tipo)"
+        tipo in ["in", "out"], "tipo debe ser 'in' u 'out'"
+
+schema Transferencia:
+    id: str
+    source_caja_id: str
+    dest_caja_id: str
+    monto: int
+    currency: str
+    timestamp: str
+    memo?: str
+
+    check:
+        monto > 0, "monto debe ser positivo"
+        len(currency) == 3, "currency ISO 4217"
+        source_caja_id != dest_caja_id, "source y dest no pueden ser la misma caja"