diff --git a/context/CONTEXT_2026-10-20_03-29-00_client-reliability-4-landed.md b/context/CONTEXT_2026-10-20_03-29-00_client-reliability-4-landed.md
new file mode 100644
index 00000000..8a1c5799
--- /dev/null
+++ b/context/CONTEXT_2026-10-20_03-29-00_client-reliability-4-landed.md
@@ -0,0 +1,3 @@
+# client-reliability-4 complete
+
+Product landed89ccb907, normal gate exit0 and7055496b ancestry verified. Backlog closed. All required local checks pass; evidence test_logs/TEST_LOG_2026-10-20_03-29-00_client-reliability-4-landed.md. Finish normal closure metadata landing/final event, then idle. No active abort, fallback/live peers,CPU or whole Stage3 claim.
diff --git a/docs/TODO.md b/docs/TODO.md
index d5fd7af1..71e4e687 100644
--- a/docs/TODO.md
+++ b/docs/TODO.md
@@ -19,6 +19,8 @@
 
 ## client-reliability
 
+- 2026-10-20: item4 done/closed after normal landing89ccb907(submission7055496b,gate exit0,unstable ancestry exit0). Full427/427 files,focused22,lifecycle12,13 reverted mutants,lint11,build/artifact/native Chromium+Firefox controlled IO pass;obsolete starts1→0. Dispatch landing event sent; preview refresh owned by dispatch. No further item without routing. Actual media fallback/live peers/active abort/CPU and whole Stage3 unverified. Closure metadata/final event follow.
+
 - 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.
diff --git a/docs/agents/backlog/client-reliability-4.json b/docs/agents/backlog/client-reliability-4.json
index fb34a39d..605d742c 100644
--- a/docs/agents/backlog/client-reliability-4.json
+++ b/docs/agents/backlog/client-reliability-4.json
@@ -1,10 +1,11 @@
 {
   "id": "client-reliability-4",
   "area": "client-reliability",
-  "status": "in-progress",
+  "status": "done",
   "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"
+  "evidence": "Product landed89ccb907 via7055496b,normal gate exit0 and unstable ancestry exit0. Full427/427 files,focused22,lifecycle12,13 reverted mutants,lint11,build/artifact and Chromium+Firefox controlled-IO smoke pass;obsolete starts1\u21920. See test_logs/TEST_LOG_2026-10-20_03-29-00_client-reliability-4-landed.md. Active abort/playback fallback/live peers/CPU unverified.",
+  "closedOn": "2026-10-20"
 }
diff --git a/test_logs/TEST_LOG_2026-10-20_03-29-00_client-reliability-4-landed.md b/test_logs/TEST_LOG_2026-10-20_03-29-00_client-reliability-4-landed.md
new file mode 100644
index 00000000..bd49e22c
--- /dev/null
+++ b/test_logs/TEST_LOG_2026-10-20_03-29-00_client-reliability-4-landed.md
@@ -0,0 +1,8 @@
+# client-reliability-4 product landing proof
+
+- Product commitce1381f50011aa71986b53c27def1b4f5aa33a44; submitted evidence tip7055496b309aaae2c10e9e9a377a5005310cfc5d.
+- MCP `land_status({id:"7055496b"})`: durable state landed, landedSha89ccb907c9560aa3a18b1ea01a9acd881932a18a at2026-10-20T03:28:32.614Z.
+- `git log -1 unstable` printed89ccb907; `git merge-base --is-ancestor 7055496b unstable`: exit0.
+- Durable result detail confirms unchanged normal npm-ci/install + npm-test gate exit0. Local full427/427 files with60s/file bound,focused22/22,lifecycle12/12,13 rejected/reverted mutants,lint11/11,build/artifact pass. See ready/precommit logs for exact commands.
+- Chromium+Firefox native-observer controlled IO smoke exit0, obsolete starts0 vs baseline1; shared live healthy/disposed checking and hidden reveal pass;0 external requests/page errors. Actual decoding/fallback/live peers/active abort/CPU-RSS/full Stage3 unverified.
+- Backlog close executed only after durable landing and ancestry proof. Product landing event delivered to dispatch; dispatch owns preview refresh. Owned browser/server closed and preview3000 unchanged. Closure metadata submission/final dispatch event remains; no next item without routing.
diff --git a/todo/TODO_2026-10-20_03-29-00_client-reliability-4-landed.md b/todo/TODO_2026-10-20_03-29-00_client-reliability-4-landed.md
new file mode 100644
index 00000000..1634c0b3
--- /dev/null
+++ b/todo/TODO_2026-10-20_03-29-00_client-reliability-4-landed.md
@@ -0,0 +1,7 @@
+# client-reliability-4
+
+- [x] Reproduce, route, implement queued URL owner disposal fix.
+- [x] Lifecycle12/focused22/full427 files/mutants13/lint11/build/Chromium+Firefox smoke.
+- [x] Normal product landing89ccb907 and durable ancestry proof.
+- [x] Close backlog and dispatch product landing event.
+- [ ] Closure metadata normal queue/durable status and final dispatch event, then idle.