}>
  This section groups the static contract and runtime surface of registry-build: generic config shape, the extension API, and CLI behavior.

## In this section

* [Configuration](/duck-registry-build/configuration)
* [Extensions](/duck-registry-build/extensions)
* [CLI](/duck-registry-build/cli)
* [Course](/duck-registry-build/course)

## Suggested reading order

1. Start with [Configuration](/duck-registry-build/configuration) to understand the collections-first model.
2. Continue to [Extensions](/duck-registry-build/extensions) for the optional behavior model.
3. If you want a concrete non-UI example, read [Course](/duck-registry-build/course).
4. Finish with [CLI](/duck-registry-build/cli) to wire the build into scripts and CI.