openai/gpt-chat-latest → B (4:1)

Side B adds a new, coherent capability: a `RoomList` RPC, matching CLI subcommand, shared request/response types, and integration tests that verify authenticated per-user room visibility and isolation. Side A largely replaces a sophisticated autocomplete/parser system with a much simpler paste-and-go textarea and redirect, deleting substantial functionality and tests while simplifying URL parsing, making it a tradeoff rather than a clear lasting improvement.