- Delete env.py module (functionality moved or no longer needed)
- Update docs/plan.md to reflect Milestone 2 completion
- Clean up constants.py by removing unused environment-related constants
- Add src/secret_auction package with __init__.py and constants.py
- Configure pyproject.toml with setuptools, pytest, and console script
- Add Doxyfile and .env.example for documentation and environment setup
- Update .gitignore to exclude Doxygen output directory
- Include tests directory placeholder and docs/plan.md for milestone
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