fix: Apply final formatting fixes for pre-commit hooks

- Remove unused imports (asyncio, pathlib.Path)
- Remove unused class imports in demo script
- Ensure all files pass ruff format and pre-commit checks

This should resolve all remaining CI linting issues.

tests/test_mcp_integration.py

@@ -7,7 +7,6 @@ without requiring actual MCP servers to be running.
 """
 
 import sys
-import asyncio
 from pathlib import Path
 
 # Add the parent directory to the path so we can import from apps