Fix Python CI workflow to only check src and tests

Limit ruff check and format to src/ and tests/ directories,
excluding experiments/ which contains temporary files.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: konard

.github/workflows/python.yml

@@ -55,11 +55,11 @@ jobs:
 
       - name: Run Ruff linting
         working-directory: ./python
-        run: ruff check .
+        run: ruff check src tests
 
       - name: Check Ruff formatting
         working-directory: ./python
-        run: ruff format --check .
+        run: ruff format --check src tests
 
       - name: Run mypy
         working-directory: ./python