chore: add .gitignore and remove cached pycache

- Created .gitignore with standard Python patterns
- Removed committed __pycache__/__init__.cpython-314.pyc from git tracking

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,7 @@
+__pycache__/
+*.py[cod]
+*.egg-info/
+.venv/
+dist/
+.pytest_cache/
+.ruff_cache/