test: raise coverage 48% -> 78% (+653 tests), fix 13 bugs found on the way - #159

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-python@v5, stefanzweifel/git-auto-commit-action@v5. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

The `python-version` input is not set. The version of Python currently in `PATH` will be used.