- **[API reference](api.md)** — every REST endpoint: auth (magic links, passkeys), projects, cards, statuses, error shapes, and a curl walkthrough.
- **[Architecture](architecture.md)** — backend layout and how the pieces fit together. Frontend architecture lives in [web/README.md](../web/README.md) instead, since it's a large enough topic on its own.
- **[Setup & configuration](setup.md)** — running without Docker, every environment variable, and the test suite.
- **[Development history](history.md)** — a stage-by-stage log of how the app got here.