fix(ui): reconcile runtime status so stale chips converge without a refresh (#11)

Live status deltas are one-shot best-effort broadcasts: a delta lost to a
disconnect window, a project-scope drop, or a not-ready store left the UI
stuck on a stale status ("thinking" vs stopped) until a hard refresh, which
rebuilds from the always-correct snapshot. Close the class, not the sites:

- Add a low-frequency runtime_status_sync reconciliation broadcast: every
  12s (lazily started, cancelled on shutdown) re-broadcast the persisted
  status + in-memory tracker state of every task with a live runtime, plus
  one final tick for tasks that just ended. Candidates come purely from
  in-memory registries (no table scans); idle system pays nothing.
- Frontend consumes it diff-before-dispatch: a tick where nothing drifted
  triggers zero store updates and zero re-renders; clearing mirrors the
  mergeLiveRuntimeField semantics already used by collab_sync.
- Fix the EventAdapter tracker state machine: tool_completed returns to
  REFLECTING (the turn is still running), and turn_completed/turn_failed
  now transition to IDLE and emit an authoritative idle runtime update.
- Guarantee the terminal board_task_status_changed in _run_session_task's
  finally: a cancelled run previously skipped it, leaving the board on
  "running". The fallback mirrors persisted state read-only.

Verified: 7 new tests in test_runtime_status_sync.py; 236 backend tests
pass with zero new failures; tsc clean; frontend structural tests pass;
dist rebuilt.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

opc/plugins/office_ui/frontend_dist/index.html

@@ -5,7 +5,7 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <link rel="icon" href="data:," />
     <title>OpenOPC Pixel Office</title>
-    <script type="module" crossorigin src="./assets/index-CTK-c7_K.js"></script>
+    <script type="module" crossorigin src="./assets/index-BgyI65M_.js"></script>
     <link rel="modulepreload" crossorigin href="./assets/phaser-DFK5Ua9d.js">
     <link rel="stylesheet" crossorigin href="./assets/index-DEvLDWDw.css">
   </head>