- One server per app run (loopback, no password); Invite attaches an all-interfaces listener to the same server and Stop sharing detaches it (guests told with 4016); members, media and Up next never reset. No solo mode: you're home on your own server unless in a friend's. - Navigation: none / yours / friend; a join passes a version gate on /health first (clear "they/you need to update", update offer). - Invite as a value (host, port, name, password flag, version, fp reserved); addresses filtered (loopback, link-local, 198.18/15, bridges) and ranked; Sharing chip, Copy invite, Stop sharing. - Alone looks like a plain player (alone replaces solo). - AppGraph builds and disposes systems; widgets use AppScope; SessionState deleted; a test caps the remaining singletons. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
apps/desktop
The Flutter desktop app (what users run; hosting runs the server from
packages/server on an isolate). Layout and rules:
../../docs/ARCHITECTURE.md. Build and test:
../../docs/DEVELOPMENT.md.