dsh-plugin-xianshou: Initiative Protocol — Limiting the timing of AI intervention, rather than the quantity

This introduces the DSH plugin dsh-plugin-xianshou maintained by yu1842. It does not limit AI usage but defines when AI intervention occurs to prevent cognitive debt. It covers fourteen tools, red-zone gates, audit trails, recycle gates, a console dashboard, isolated profile installation methods, a compatibility matrix, and a clear list of explicitly defined exclusions.