feat: segundo módulo (nakui) + admin API + brahman-status

Dos cosas en una sesión, en el orden discutido:

(1) Segundo módulo brahman vivo: nakui-core
  - crates/modules/nakui/core/Cargo.toml: deps brahman-card,
    brahman-sidecar, ulid.
  - crates/modules/nakui/core/src/bin/nakui.rs: brahman_card_for_nakui()
    construye una Card como Lifecycle::Daemon, Supervision::Restart,
    flow.input "command" (json) + flow.output "report" (json). El
    cmd_run llama brahman_sidecar::spawn antes de levantar el server
    de nakui.

(2) crates/shared/brahman-sidecar (estrena crates/shared/)
  Boilerplate del sidecar extraído (DRY): el thread con tokio current
  thread runtime, conexión vía Client::connect, ping loop. Yahweh y
  nakui ahora consumen este crate. API:
  - spawn(card)                    fire-and-forget
  - spawn_with_handle(config)      con JoinHandle
  Example "presence" útil para demos: módulo dummy con label tomado
  del primer arg que se queda vivo hasta SIGTERM.

(3) crates/core/brahman-admin: observabilidad del broker
  Socket Unix paralelo en \$BRAHMAN_ADMIN_SOCKET (default
  \$XDG_RUNTIME_DIR/brahman-admin.sock). Cada conexión recibe un
  StatusSnapshot JSON line-delimited y se cierra. Compatible con nc/socat.
  - StatusSnapshot { server, protocol, init_attached, sessions, matches }
  - server::AdminServer
  - client::query(path)
  - example "brahman-status" CLI

(4) Wiring de ente-zero
  En primordial_loop, junto al handshake server, ahora también levanta
  AdminServer con misma política de degradación grácil.

(5) brahman-broker: BrokeredCard ahora incluye lifecycle. Endpoint y
  Match derivan Serialize/Deserialize. Nuevo método cards() expone
  iterador de BrokeredCard para que el admin pueda construir snapshots.

(6) brahman-card: re-export pub use ulid::* para que módulos no
  necesiten depender de ulid directamente.

(7) yahweh-shell migrado al sidecar compartido. Su brahman_client.rs
  pasa de 96 a 53 líneas: sólo declara la Card, delega el spawn.

Demo end-to-end:
  $ ente-zero &
  $ presence demo.producer &
  $ presence demo.consumer &
  $ brahman-status

  Init: server=0.1.0 protocol=0.1.0 attached=true
  Sessions (2):
    01KR42TY1J... demo.producer  lifecycle=Daemon  priority=Normal
    01KR42TY1K... demo.consumer  lifecycle=Daemon  priority=Normal
  Matches (2):
    demo.producer.in  ←  demo.consumer.out  via Exact
    demo.consumer.in  ←  demo.producer.out  via Exact

El broker matchea bidireccional por tipo. El admin lo expone.

Tests: 27/27. cargo check --workspace: 0 errores.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Cargo.lock

@@ -1139,6 +1139,22 @@ dependencies = [
  "syn 2.0.117",
 ]
 
+[[package]]
+name = "brahman-admin"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+ "brahman-broker",
+ "brahman-card",
+ "serde",
+ "serde_json",
+ "tempfile",
+ "thiserror 2.0.18",
+ "tokio",
+ "tracing",
+ "ulid",
+]
+
 [[package]]
 name = "brahman-broker"
 version = "0.1.0"
@@ -1176,6 +1192,17 @@ dependencies = [
  "ulid",
 ]
 
+[[package]]
+name = "brahman-sidecar"
+version = "0.1.0"
+dependencies = [
+ "brahman-card",
+ "brahman-handshake",
+ "tokio",
+ "tracing",
+ "tracing-subscriber",
+]
+
 [[package]]
 name = "bs58"
 version = "0.5.1"
@@ -2772,6 +2799,7 @@ name = "ente-zero"
 version = "0.0.1"
 dependencies = [
  "anyhow",
+ "brahman-admin",
  "brahman-broker",
  "brahman-handshake",
  "ente-brain",
@@ -5785,6 +5813,8 @@ dependencies = [
 name = "nakui-core"
 version = "0.1.0"
 dependencies = [
+ "brahman-card",
+ "brahman-sidecar",
  "petgraph",
  "rhai",
  "serde",
@@ -5793,6 +5823,7 @@ dependencies = [
  "surrealdb",
  "thiserror 1.0.69",
  "tokio",
+ "ulid",
  "uuid",
 ]
 
@@ -11440,7 +11471,7 @@ name = "yahweh-shell"
 version = "0.1.0"
 dependencies = [
  "brahman-card",
- "brahman-handshake",
+ "brahman-sidecar",
  "gpui",
  "notify",
  "serde",