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Two Matrix protocol gaps (Phase A), gate-green (683 tests): - Mark as Unread: m.marked_unread room account data (+ com.famedly.marked_unread fallback), a new markedUnreadAtom binder that seeds from account data and clears on our own read receipt (MSC2867). RoomNavItem gains Mark as Unread / Read menu items and lights the row dot for a marked room. Tested. - Low Priority: m.lowpriority room tag mirroring favourites — a context-menu toggle (mutually exclusive with Favorite) and a collapsed Low Priority category sorted to the bottom of the Home room list. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>