client-reliability-3: close verified landed lifecycle fix and record dispatch handoff

docs/agents/backlog/client-reliability-3.json

@@ -1,9 +1,10 @@
 {
  "id": "client-reliability-3",
  "area": "client-reliability",
- "status": "in-progress",
+ "status": "done",
  "title": "Cancel queued torrent health probes when their last feed owner is disposed",
  "blockedOn": null,
  "addedOn": "2026-10-19",
- "filedAt": "f9adfc8f531bcb77d4dc6e5487f76dbce0916167"
+ "filedAt": "f9adfc8f531bcb77d4dc6e5487f76dbce0916167",
+ "closedOn": "2026-10-19"
 }