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

wiki/10-modernization-roadmap.md

@@ -53,6 +53,10 @@ Implementation status update:
 - Phase B has started: REC template registry loading and startup validation are now implemented in IPL.
 - Phase B progression: runtime template registry state is now persisted and passed into broker workers for dispatch-time template validation.
 - Reliability progression: deterministic ack/nack behavior and retry/DLQ queue topology are implemented for `rec.read` and `rec.write`.
+- Runtime progression: unified dispatcher pool and single-queue consumption model are active.
+- Lifecycle progression: BEDS now runs as a resident process after IPL and supports coordinated shutdown via broker `shutdown` command.
+- Diagnostics progression: startup now emits structured IPL milestone logs (including severity examples) into logger storage for observability validation.
+- Tooling progression: Rust Observatory utility (`log_dumper`) provides development log browsing, root-guid tracing, and single-record view.
 
 ## Must-Keep Invariants