docs: record client-reliability-4 merged-tree validation

docs/TODO.md

@@ -16,6 +16,8 @@
 
 ## client-reliability
 
+- 2026-10-20: item4 ready atce1381f5; full427/427 file exits0 with60s/file bound,focused22/22,lifecycle12/12,13 rejected/reverted mutants,lint11/11,build/artifact and Chromium+Firefox controlled native-observer smoke pass (obsolete starts0). Remaining normal queue/durable landing/ancestry then close/report. Actual fallback/live IO/active abort/CPU remain unverified.
+
 - 2026-10-20: item4 routed implementation in URL observer/controller complete locally;12 lifecycle scenarios and13 reverted mutants, focused/lint/build pass. Queued last-owner work settles without cache/mirror/stale UI; shared owners, immediate retry and hidden reveal covered. Remaining: native browser smoke/full merged-tree gate/normal landing/closure; active abort/fallback/CPU unverified.
 
 - 2026-10-20: client-reliability-4 investigation at4c54858c reproduces queued URL media start after feed disposal: active3/queued1 before and after disposal, then1 obsolete start(expected0); shared live-owner control deduplicates and receives healthy badge. Strict assertion exits1, diagnostic/control naturally exit0. No product/tests changed; awaiting dispatch fix routing. Active abort/browser/fallback/CPU unverified. Evidence: test_logs/TEST_LOG_2026-10-20_03-10-00_client-reliability-4.md.

docs/agents/backlog/client-reliability-4.json

@@ -1,9 +1,10 @@
 {
- "id": "client-reliability-4",
- "area": "client-reliability",
- "status": "in-progress",
- "title": "Reproduce remaining source-health cancellation defect at current HEAD before scoping a fix",
- "blockedOn": null,
- "addedOn": "2026-10-20",
- "filedAt": "604c8c61f4783717eb0cff7ca7ca33efb59aac8a"
+  "id": "client-reliability-4",
+  "area": "client-reliability",
+  "status": "in-progress",
+  "title": "Reproduce remaining source-health cancellation defect at current HEAD before scoping a fix",
+  "blockedOn": null,
+  "addedOn": "2026-10-20",
+  "filedAt": "604c8c61f4783717eb0cff7ca7ca33efb59aac8a",
+  "evidence": "Reproduced at4c54858c; bounded queued URL owner fix ce1381f5. Full427/427 files,focused22,new lifecycle12,13 reverted mutants,lint11,build and Chromium+Firefox controlled native observer smoke pass. Normal landing and closure pending; evidence test_logs/TEST_LOG_2026-10-20_03-23-30_client-reliability-4-ready.md"
 }