Fix linting: Remove unused sys import from conftest.py

- Remove unused import that was causing ruff F401 error
- Tests were passing but linting was failing
- All checks now pass

Author: dknell

tests/conftest.py

@@ -1,7 +1,6 @@
 """Test configuration and fixtures."""
 
 import os
-import sys
 from unittest.mock import patch
 
 import pytest