POST /rooms/{id}/upgrade copies only Synapse's fixed list of state, so an
upgrade silently dropped everything Lotus keeps in room state: an
audio-only voice channel became camera/screenshare-allowed, user limits
and bitrate caps vanished, the soundboard pack was lost, and a room set
to delete messages after 7 days kept new ones forever.
RoomUpgrade now reads the client-owned state first (utils/roomUpgradeState,
unit-tested: io.lotus.*, m.room.retention, role tags, room emoji packs)
and re-creates it in the replacement room; a partial copy is reported in
the dialog instead of closing silently.
Verified headless through the UI (v10 room with voice limit, quality
policy, a soundboard pack and retention → upgrade): before, none
survived; now all four are in the new room.
Follow-up (not here): for spaces, the children's m.space.parent still
point at the old space.
Fixes#327
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017PCb59uY3UKqDqt7B6hzd5
