Move per-step `when` filters: unit tests now run on every branch push,
integration tests keep pull_request + main/dev branch restriction.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
- Update Woodpecker to run unit and integration tests in parallel
- Add GitHub Actions workflow for PyPI trusted publishing on main
- Add license, classifiers, keywords, and URLs to pyproject.toml
- Fix ruff lint errors (unused imports, duplicate class name) and formatting