openai/gpt-chat-latest → B (5:1)

Side B adds a substantial new end-user capability by introducing a `room create` CLI command, wiring it through the RPC path, updating documentation, and simplifying the room model by removing the unused visibility field and related state. Side A is a targeted configuration fix that defines `GITHUB_API_BASE_URL` with a default to prevent a `NameError` in the OAuth callback, which is valuable but much narrower in long-term impact.