fix(runtime): complete reconnect recovery paths

tests/unit_tests/box/test_box_connector.py

@@ -126,6 +126,29 @@ async def test_box_runtime_connector_cleans_partial_transport_on_connect_failure
     connector._close_managed_subprocess.assert_awaited_once()
 
 
+@pytest.mark.asyncio
+async def test_box_runtime_connector_starts_heartbeat_after_reconnect(
+    monkeypatch: pytest.MonkeyPatch,
+):
+    monkeypatch.setattr('langbot.pkg.utils.platform.get_platform', lambda: 'linux')
+    monkeypatch.setattr('langbot.pkg.utils.platform.standalone_box', False)
+    connector = BoxRuntimeConnector(make_app(Mock()))
+    connector._start_local_stdio = AsyncMock(side_effect=[RuntimeError('bind failed'), None])
+    connector._stop_transport = AsyncMock()
+    connector._close_managed_subprocess = AsyncMock()
+
+    with pytest.raises(RuntimeError, match='bind failed'):
+        await connector.initialize()
+
+    assert connector._heartbeat_task is None
+
+    await connector.reconnect()
+
+    assert connector._heartbeat_task is not None
+    assert not connector._heartbeat_task.done()
+    await connector.aclose()
+
+
 @pytest.mark.asyncio
 async def test_box_stdio_connection_does_not_capture_unconsumed_stderr(
     monkeypatch: pytest.MonkeyPatch,

tests/unit_tests/box/test_box_service.py

@@ -347,6 +347,28 @@ async def test_box_service_shutdown_reaps_connector_when_runtime_rpc_is_offline(
     connector.aclose.assert_awaited_once()
 
 
+@pytest.mark.asyncio
+async def test_box_service_reconnect_restores_workspace_and_runs_cleanup(
+    monkeypatch: pytest.MonkeyPatch,
+):
+    app = make_app(Mock())
+    app.skill_mgr = SimpleNamespace(reload_skills=AsyncMock())
+    service = BoxService(app, client=Mock(spec=BoxRuntimeClient))
+    connector = Mock()
+    connector.reconnect = AsyncMock()
+    service._ensure_default_workspace = Mock()
+    service._purge_attachment_dirs = AsyncMock()
+    monkeypatch.setattr('langbot.pkg.box.service.asyncio.sleep', AsyncMock())
+
+    await service._reconnect_loop(connector)
+
+    connector.reconnect.assert_awaited_once()
+    service._ensure_default_workspace.assert_called_once()
+    service._purge_attachment_dirs.assert_awaited_once()
+    app.skill_mgr.reload_skills.assert_awaited_once()
+    assert service.available is True
+
+
 @pytest.mark.asyncio
 async def test_box_runtime_reuses_request_session():
     logger = Mock()