fix: apply isort formatting to fix CI linting

Applied isort to properly sort all imports according to PEP8:
- Standard library imports first
- Third-party imports second
- Local imports last
- Alphabetical ordering within each group

All tests still passing after import reordering.

tests/test_tools.py

@@ -2,10 +2,11 @@
 Tests for individual tool implementations
 """
 
-import pytest
 from unittest.mock import Mock, patch
 
-from tools import ThinkDeeperTool, ReviewCodeTool, DebugIssueTool, AnalyzeTool
+import pytest
+
+from tools import AnalyzeTool, DebugIssueTool, ReviewCodeTool, ThinkDeeperTool
 
 
 class TestThinkDeeperTool: