EXTENSIONS.md documented the WebUI-side extension infrastructure (loader, manifest,
capabilities incl. settings_schema / skin scheme / TTS engine, install client) but
never linked to hermes-webui/hermes-webui-extensions — the public repo where the
vetted, one-click-installable gallery entries actually live and where new extensions
are contributed.
Adds two cross-links, no behavior change:
- intro callout: points to the library repo + its docs/extension-entry.md, framing
this doc as the infrastructure side and the library repo as where entries live.
- a 'Contributing to the extension library' pointer at the end of the authoring
guidance, describing the entry-PR + CI-safety-gate + registry-publish flow.
Docs-only.
nesquena-hermes
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