fix: Apply formatting and linting fixes to MCP server tests

- Fixed import formatting in conftest.py
- Added noqa comment for late import required by path setup
- All ruff format and lint checks now pass
- All pytest tests pass successfully

🤖 Generated with Claude Code

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

mcp_server/tests/conftest.py

@@ -5,13 +5,14 @@ This file prevents pytest from loading the parent project's conftest.py
 
 import sys
 from pathlib import Path
+
 import pytest
 
 # Add src directory to Python path for imports
 src_path = Path(__file__).parent.parent / 'src'
 sys.path.insert(0, str(src_path))
 
-from config.schema import GraphitiConfig
+from config.schema import GraphitiConfig  # noqa: E402
 
 
 @pytest.fixture