openai/gpt-chat-latest → B (4:3)

Side B restores substantial end-user functionality by wiring browser authentication with session cookies, adding web posting, routing, and private-room UI with capability checks, enabling a complete web workflow instead of only CLI access. Side A adds a useful `room create` CLI command and simplifies the room model by removing unused visibility state, but much of the patch is API cleanup and documentation around a narrower feature.