feat(sandokan): CLI de prueba + fix wire serialization

apps/sandokan (binario `sandokan`): CLI para probar el orquestador.
Subcomandos: daemon, run <exec> [args], list, status, telemetry, stop.

Fix: Intent serializaba Card directo, pero Card tiene un campo
`#[serde(flatten)] extensions` incompatible con postcard ("sequence
length must be known"). Intent::card ahora usa #[serde(with)] que
proyecta Card↔WireCard en el límite de serialización (las extensions
locales se descartan al cruzar el wire — comportamiento correcto).

Smoke test verificado end-to-end: daemon + run /bin/sleep + list +
status Running + telemetry + stop + status Killed.

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

Cargo.toml

@@ -177,6 +177,7 @@ members = [
     # ============================================================
     "crates/apps/brahman-broker-explorer",
     "crates/apps/brahman-demo",
+    "crates/apps/sandokan",
     "crates/apps/nahual-shell",
     "crates/apps/nahual-file-explorer",
     "crates/apps/nahual-database-explorer",