- Replace synchronous httpx.post() with async httpx.AsyncClient in push_metadata_to_source endpoint to avoid blocking the event loop
- Guard data["access_token"] in CLI analyst setup with .get() and a clear error message on missing key
- Add test_push_non_keboola_table_fails and test_push_keboola_table to TestMetadataAPI, covering 400/404 path and the happy path with mocked async httpx
