Skills and commands edited mid-session now appear without a restart.

v2.1.216 fixed skills and slash commands changed during a session not showing in the slash menu until restart, and fixed plugin skills losing their plugin: prefix in autocomplete (changelog). Small fix, big loop improvement: you can edit a SKILL.md and invoke it in the same session. The old workaround cost a full context rebuild after every edit, which is exactly the friction that stops people from iterating on skills at all.