openai/gpt-chat-latest → B (3:2)

Side B adds a new top-level CLI `room create` command wired through to the RPC, updates the server to support the simplified `RoomCreate` flow, removes the unused room visibility concept from events/reducer state, and updates documentation and tests accordingly. Side A is a solid UX improvement that makes ranked child pin icons submit the existing `set_garden_pin` unpin action and adds browser coverage, but it is a narrower interface enhancement compared with B's broader, lasting API and architecture simplification.