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The "Test without pylance or pandas" CI job only ran `test_table.py`, so the regression fixed in #3606 had no guard: sync namespace operations used to route through the Python `lance_namespace` client, whose `dir` implementation ships in the optional `pylance` extra, so `lancedb.connect(path).list_namespaces()` failed with `No module named 'lance'` while the async API worked. Adds `python/python/tests/test_namespace_no_pylance.py` and runs it in that job. Its `without_pylance` fixture blocks `lance` imports, so the guard also fires in environments that do have `pylance` installed. Coverage: the original reproducer, nested namespace lifecycle, namespaced and root table lifecycle, the async path, and the one API that legitimately still needs `pylance` (`namespace_client()`). Verified the guard actually catches the regression: against `lancedb==0.33.0`, three of these tests fail with the original error; against a fixed build all pass. Co-authored-by: Xuanwo <github@xuanwo.io>