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/unit/test_confidence.py

@@ -60,7 +60,9 @@ class TestConfidenceChecker:
 
         confidence = checker.assess(context)
 
-        assert 0.7 <= confidence < 0.9, f"Expected medium confidence 0.7-0.9, got {confidence}"
+        assert 0.7 <= confidence < 0.9, (
+            f"Expected medium confidence 0.7-0.9, got {confidence}"
+        )
         assert confidence == 0.7, "Should be exactly 70%"
 
     def test_confidence_checks_recorded(self, sample_context):