Maps current namespace dir creation/ownership (live on 9201), the 9-app/13-mount
media blast radius, run-identity table (FileBrowser=uid1000, komga/audiobookshelf=root),
LXC idmap, and proposes the setgid GID-1000 convention. Flags: MigrateAll's merge walk
drops setgid+owner on userdata. Ends with a 7-item fork list. No code/deploy.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
