feat: release 2.2.0 with PC-only tests and execution reliability fixes

Unify task scheduling and queue state, fix Android input and observation recovery, preserve screenshot paths, and match final review criteria accurately. Add collapsible copyable results and publish the complete 2.1.0 upgrade notes. Validation: 3189 backend tests, 326 frontend tests, 24 client tests, production build and quality gates.

mcp_server/tools/task_manager.py

@@ -277,7 +277,7 @@ def mobile_manage_task(
       An exploration deletes its conversation runs, preserving independent reruns.
     - review: Record ONLY the user's explicitly stated passed/failed decision with
       review_reason and user_confirmed=true. Never label the agent's verdict as human.
-    - **'status'**: Returns `trace_id`, `status` ('running'/'pausing'/'task_paused'/
+    - **'status'**: Returns `trace_id`, `status` ('pending'/'running'/'pausing'/'task_paused'/
       'resuming'/'completed'/'failed'/'cancelled'/'interrupted'), `device_serial` (which phone owns this task in multi-device
       setups), `task_desc`, `model`, `elapsed_seconds`, a `test_summary` (when
       the run declared verification check items: machine-readable