style: apply ruff formatting to all files

Formatted 14 files to comply with ruff formatting rules:
- Consistent code style across codebase
- Improved readability
- All formatting checks now pass

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

tests/conftest.py

@@ -5,7 +5,6 @@ This file is automatically loaded by pytest and provides
 shared fixtures available to all test modules.
 """
 
-
 import pytest