feat(loop): codify external intrinsic loop management, progressive remediation, and operational runbook

- Add bin/gravity.py loop diagnostics, reconstruction, and progressive remediation
- Wire hard-break alerting to job-log audit and operator direct message
- Add comprehensive architecture and operational specification in docs/LOOP-MANAGEMENT.md
- Add sidechat thread auto-provisioning fallback on 'Navigated to: None' in bin/dm.py
- Support Muse unconfirmed signup error handling in bin/muse-signin.py
- Track dynamic pipe sidechat mappings in job-sidechats.json

job-sidechats.json

@@ -22,5 +22,15 @@
     "thread_uuid": "0077e918-9ac8-40ba-b0ad-65f9f78037c4",
     "agent": "opm",
     "created_at": "2026-10-04T16:43:03.587214+00:00"
+  },
+  "pipe-7d2896": {
+    "thread_uuid": "78e03d7a-0ba2-440e-a730-6f3b3737cbac",
+    "agent": "opm",
+    "created_at": "2026-10-04T16:48:03.062944+00:00"
+  },
+  "pipe-933473": {
+    "thread_uuid": "dc2288ef-3fe1-4b12-bf31-08c482398c0f",
+    "agent": "646",
+    "created_at": "2026-10-04T16:50:35.478877+00:00"
   }
 }