feat: resident runtime, shutdown command, observatory, and IPL logging hardening

- keep BEDS resident after IPL and coordinate clean shutdown
- propagate AMQP shutdown command across dispatcher pool
- add structured IPL milestone/event-chain logging with root GUID context
- add optional trace_on config for verbose method-entry diagnostics
- add dev purge-on-IPL controls for admin/logger collections
- add log level showcase events after IPL node-green
- add Mongo logger store helpers for chain/root lookup and purge
- add/modernize BEDS Observatory log_dumper utility UI and root record view
- refresh source headers and wiki docs for current architecture/runtime
- add architecture visual brief for leadership/image-generation workflows

Cargo.toml

@@ -15,4 +15,7 @@ tracing-journald = "0.3"
 mongodb = { version = "3", features = ["sync"] }
 futures-lite = "2"
 lapin = "2"
-tokio = { version = "1", features = ["full"] }
+tokio = { version = "1", features = ["full"] }
+axum = "0.8"
+chrono = { version = "0.4", default-features = false, features = ["clock", "std"] }
+uuid = { version = "1", features = ["v4"] }