- add pyproject.toml with setuptools build system
- add console script entry point `setup-hibernate`
- migrate main.py to src/setup_hibernate/__main__.py
- add MIRRORS file with Git and PyPI endpoints
- enable PEP 621 metadata and src layout
https://chatgpt.com/share/6964c8c0-8b94-800f-be8e-10c4fc8a2f30