openai/gpt-chat-latest → A (3:2)

Side A adds a new end-user capability by implementing the `room create` CLI command end-to-end, wiring it to the existing RPC, handling authentication, JSON/text output, updating documentation, and simplifying the data model by removing the unused room visibility field and replacing the room registry with a `HashSet` of room IDs. Side B improves the vote-compare experience with a fullscreen layout, live preview morphing, and clearer edge-history ordering, but these are primarily UI refinements rather than a foundational project capability.