feat: add prompt-first batches and pausable task guidance

tests/unit/admin_console/test_server_lifecycle.py

@@ -159,7 +159,7 @@ async def test_shutdown_marks_only_ui_owned_running_sessions():
     ):
         await on_shutdown()
 
-    update_status.assert_called_once_with("ui-running", "cancelled")
+    update_status.assert_called_once_with("ui-running", "interrupted")
     assert state.queue_items == []
     state.active_session_id = None
     state.is_shutting_down = False