feat(sandokan-local): B1.2 — LocalEngine

Primera implementación del trait Engine: orquestación in-process.

- LocalEngine encarna Cards vía arje-incarnate, mantiene un registro
  HashMap<Ulid, Entity> de entidades activas.
- run()       — incarnate + registro; mergea env del contexto.
- stop()      — SIGTERM + período de gracia + SIGKILL + reap.
- list()      — reaping perezoso (waitpid WNOHANG) + handles activos.
- status()    — reaping perezoso + LifecycleState.
- telemetry() — lee /proc/<pid>/status (VmRSS + Threads), sin invocar
                binarios externos.
- Reaping sin task de fondo: cada consulta hace waitpid WNOHANG.

proc.rs: lectura directa de procfs (mem_bytes, thread_count, proc_exists).

4 tests verdes (2 proc + 2 engine: empty list, NotFound paths).
cargo check --workspace verde.

v1: IsolationLevel es advisory (Sealed reservado para cuando el Intent
transporte rootfs spec). CPU% pendiente (requiere 2 samples).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

crates/runtime/sandokan-local/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "sandokan-local"
+description = "LocalEngine: implementación in-process del orquestador sandokan. Encarna Cards vía arje-incarnate, trackea lifecycle, reaping."
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+authors.workspace = true
+publish.workspace = true
+
+[dependencies]
+sandokan-core = { path = "../sandokan-core" }
+sandokan-lifecycle = { path = "../sandokan-lifecycle" }
+arje-incarnate = { path = "../../init/arje-incarnate" }
+brahman-card = { path = "../../protocol/brahman-card" }
+async-trait = { workspace = true }
+tokio = { workspace = true }
+nix = { workspace = true }
+ulid = { workspace = true }