Migrate retired /usr/_office and /usr/_desktop trees from plugin startup into /usr/plugins/<plugin>. Update office document storage, desktop session/runtime paths, and context-scoped screenshots to use the plugin-owned state layout. Add focused tests for retired-state migration and the new path behavior.
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.
Run Office and Desktop apt operations through a shared in-process retry guard so startup/self-update hooks wait out transient apt locks instead of failing early. Include LibreOffice runtime packages in Desktop preparation because Desktop status and Writer/Calc/Impress launch paths require soffice, and cover both behaviors with regression tests.
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.
