- Initialize FastAPI backend with uv package manager
- Configure Black, Ruff, pytest, mypy in pyproject.toml
- Add health check endpoint and initial test
- Create AGENTS.md with coding guidelines for AI agents
- Add pre-commit hook to enforce linting and tests
- Add PROJECT_PLAN.md with 7-phase development roadmap
- Add CLAUDE.md with AI agent coding guidelines
- Add docs/ARCHITECTURE.md with technical deep-dive
- Add docs/GAME_RULES.md template for home rule definitions
- Create directory structure for frontend, backend, shared