openai/gpt-chat-latest → B (3:2)

Side B introduces a first-class `room create` CLI command wired through the RPC layer, updates the shared `RpcCommand` schema, simplifies room state by removing the unused visibility concept, and adjusts reducer, server, and tests accordingly. Side A improves the garden UI by showing pairwise vote counts and making the pin HUD unpin directly via `POST /ui`, but these are primarily interface enhancements compared with B's enduring API and data-model cleanup.