- Add auction.py with add_bid and find_winner functions
- Add env.py with stdlib-based .env loader (no python-dotenv)
- Add tests/test_auction.py with test cases for auction functions
- Remove .env.example (tokens not meant to be committed)
- Update docs/plan.md to mark Milestone 2 as complete
- 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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