Attach the Browser canvas to active Docker sessions by returning an initial snapshot on subscribe and preserving valid frames through state-only updates. Route Markdown document opens through the right-canvas Desktop editor instead of the legacy office modal. Skip automatic office document response affordances for subordinate agents so delegated reviews keep their actual content.
Track active Desktop runtime preparation in the _desktop hook, expose installing status through Desktop session status, and have the Desktop frontend poll with a neutral install message instead of showing missing dependencies while packages are still being installed after an update.
Add the built-in _desktop plugin as the owner of Xpra/Xfce lifecycle, /desktop route installation, Desktop state, session APIs, surface registration, and the linux-desktop skill. Leave _office with explicit compatibility facades and self-update delegates so users coming from 1.10 through 1.13 keep their runtime cleanup path.
