openai/gpt-chat-latest → A (4:3)

Side A adds a complete `room create` CLI command wired through the RPC path, updates the server to handle the simplified `RoomCreate { slug }` request, removes an unused visibility concept, converts room tracking to a simpler `HashSet`, and updates tests and documentation accordingly. Side B improves the authentication UX by returning HTML fragments and teaching the shared JS form handler to morph a form's `innerHTML` instead of redirecting, but its impact is primarily on user interaction rather than introducing a durable project capability.