Adds a polling helper that blocks until the project switch completes,
errors out, or times out. Replaces the fragile 10x1s blind poll in
test_full_live_workflow with a condition-based wait on the
/api/project_switch_status endpoint.
Features:
- Polls /api/project_switch_status every 200ms (configurable)
- Returns immediately on error (with the error in the result)
- Path matching: exact match OR basename match (handles absolute vs relative)
- Times out with a clear 'timeout' flag instead of a generic assertion
- Optional expected_path: if None, returns on any in_progress=False
- src/api_hook_client.py: new wait_for_project_switch method (37 lines)
- tests/test_api_hook_client_wait_for_project_switch.py: 6 unit tests
with mocked _make_request covering all paths