Prefer `skillhub` for skill discovery/install/update, then fallback to `clawhub` when unavailable or no match. Use when users ask about skills, 插件, or capabi...
- Initial release of skillhub-preference. - Provides clear policy for preferring skillhub over clawhub for skill discovery, installation, or updates. - Includes fallback guidance when skillhub is unavailable or finds no matches. - Advises summarizing source, version, and risk signals before installing a skill. - Instructs to use and report the output of `skillhub search <keywords>` for all search requests.