milestone: enforce required services and add mongo logger PoC path

wiki/06-queue-topology.md

@@ -159,6 +159,13 @@ Current proof-of-concept verification for the two active appServer brokers is co
 - `tests/broker_pool_test.rs` validates that configured rBroker/wBroker pool instances spawn.
 - `tests/broker_message_flow_test.rs` validates end-to-end message flow by publishing `ping` events to
     `rec.read` and `rec.write` and asserting broker replies.
+- `tests/broker_message_flow_test.rs` also validates logger sequence round-trip by publishing a `write`
+    event to `rec.write` with `template="Logger"`, then fetching via `fetch` on `rec.read` and asserting
+    that the newly written log message is returned.
+
+Current logger sequence in POC now writes and reads through MongoDB (`msLogs`) via the
+`Logger` template path (`rec.write` for write, `rec.read` for fetch), using credentials from
+the active environment config.
 
 These tests provide a lightweight deployment confidence check while the framework is still in the
 "POC before guardrails" phase.