style: fix linting and formatting issues

- Run black formatter on all Python files
- Fix ruff linting issues:
  - Remove unused imports
  - Remove unused variables
  - Fix f-string without placeholders
- All 37 tests still pass
- Code quality improved for CI/CD compliance

🧹 Generated with [Claude Code](https://claude.ai/code)

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

tests/test_config.py

@@ -2,10 +2,17 @@
 Tests for configuration
 """
 
-from config import (DEFAULT_MODEL, MAX_CONTEXT_TOKENS,
-                    TEMPERATURE_ANALYTICAL, TEMPERATURE_BALANCED,
-                    TEMPERATURE_CREATIVE, TOOL_TRIGGERS, __author__,
-                    __updated__, __version__)
+from config import (
+    DEFAULT_MODEL,
+    MAX_CONTEXT_TOKENS,
+    TEMPERATURE_ANALYTICAL,
+    TEMPERATURE_BALANCED,
+    TEMPERATURE_CREATIVE,
+    TOOL_TRIGGERS,
+    __author__,
+    __updated__,
+    __version__,
+)
 
 
 class TestConfig:
@@ -15,11 +22,11 @@ class TestConfig:
         """Test version information exists and has correct format"""
         # Check version format (e.g., "2.4.1")
         assert isinstance(__version__, str)
-        assert len(__version__.split('.')) == 3  # Major.Minor.Patch
-        
+        assert len(__version__.split(".")) == 3  # Major.Minor.Patch
+
         # Check author
         assert __author__ == "Fahad Gilani"
-        
+
         # Check updated date exists (don't assert on specific format/value)
         assert isinstance(__updated__, str)