The guide tier said how to compose plugins with `cordis.yml` but never how to
reach a provider other than DeepSeek, so the two things a person actually does
— give a catalog provider its key from the Models page, and declare a gateway
the installed catalog does not ship — had no home outside package READMEs.
The new page covers both entry points and the relationship between them: the
Models page and `$DSH_HOME/settings.yaml` write one document, over a
`llm-pi-ai` adapter that mounts dormant until that document names routes. It
carries the settings shape, catalog replacement and its capacity fallbacks,
credential references, and the four failures a misconfigured route produces,
and links the generated config catalog for exhaustive fields.
It sits between Quick start and Configuration in the guide sidebar, which is
where a reader hits the question.
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