#188 test_update_api.test_successful_update_processing times out

The test_successful_update_processing test in tests/integration/test_update_api.py fails with a 408 timeout: ``` AssertionError: Update failed: { "error": "Update 'approve_request' did not complete within 30s", "status": "TIMEOUT" } assert 408 == 200 ``` The test submits a workflow that waits for an update signal, then sends the update via API. The update is not being processed within the 30s timeout. Potential causes: 1. Worker not picking up the update event 2. Event routing issue between API and worker 3. Race condition in update signal handling Observed during parallel pytest run (-n 4).