- Add comprehensive tests for all packages (3572 tests, 100% branch coverage)
- Split oversized test files to stay under 500-line limit
- Add per-file ruff ignores for test-appropriate suppressions
- Fix _cache_decks.py to properly convert JSON lists to tuples
- Add session-scoped conftest fixture for logging handler cleanup (Python 3.14)
- Update ruff pre-commit hook to v0.15.2
- Add codespell ignore words for test data
- Add generated output files to .gitignore
- Move puzzle_solver/, poker_modifier_app/, articles/, tests/ into python_pkg/
- Move moviepy_showcase.py and _moviepy_*.py into python_pkg/moviepy_showcase/
- Update all imports to use python_pkg. prefix
- Update pyproject.toml per-file-ignores and pytest testpaths
- Add pre-commit hook to enforce Python files under python_pkg/
