openai/gpt-chat-latest → B (4:1)

Side B fixes a real concurrency bug by ensuring `tokio::sync::RwLock` read guards are dropped before nested lock acquisitions, preventing deadlocks in `RoomCreate` and `RoomGrant`, and adds an integration test covering room creation. Side A replaces the autocomplete/parser graph with a much simpler paste-and-go flow and removes substantial functionality, which may simplify maintenance but also discards capabilities rather than delivering a targeted correctness improvement.