fix: remove unused logging import in test

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: viniciusdsmello

tests/test_tracing_core.py

@@ -738,7 +738,6 @@ def my_func(user_query: str) -> Dict[str, Any]:
     @patch.object(tracer, "_publish", False)
     def test_promote_missing_key_warns(self) -> None:
         """Keys not found in inputs or outputs should log a warning."""
-        import logging
 
         @tracer.trace(promote={"nonexistent": "col"})
         def my_func() -> Dict[str, Any]: