~anthropic/claude-sonnet-latest → B (6:4)

Side B adds a real CLI feature (room create) plus a genuine simplification—removing an unused visibility concept that only ever had one meaningful value ('private'), simplifying the reducer's HashMap<String,RoomState> to a HashSet<String> and cleaning up events/timeline/tests consistently across the codebase. Side A is a smaller, more surface-level fix (route rename, small bug fixes, removing a button) that is useful but narrower in scope and impact than B's cross-cutting simplification plus new CLI capability.