Patch release fixing project URLs and adding CI.
- Fixed GitHub URLs in pyproject.toml and README (were pointing to nonexistent org)
- Fixed logo SVG viewBox so closing brace renders correctly
- Removed comparison table with other tools
- Added GitHub Actions CI workflow (pytest + mypy + ruff on Python 3.10/3.11/3.12)
- Added CHANGELOG.md
- Aligned PyPI description with README headline