openai/gpt-chat-latest → A (5:3)

Side A adds a substantive new user-facing capability by introducing the `room create` CLI command end-to-end, wiring it to the `RoomCreate` RPC, handling authentication, JSON/text output, and updating documentation. It also simplifies the room model by removing the unused room visibility field and replacing the room registry with a `HashSet`, reducing unnecessary complexity, whereas Side B primarily changes the DSL syntax to require explanation blocks before votes and updates the parser, UI, fixtures, and tests to match that new format without adding comparable new functionality.