openai/gpt-chat-latest → A (3:2)

Side A adds a new end-to-end capability: a RoomList RPC, CLI subcommand, shared request/response types, server authorization logic that filters rooms by the authenticated principal's grants, and comprehensive integration tests verifying per-user isolation. Side B improves Reddit rendering with richer HTML, image/link extraction, CSS, and a parsing test, but it is primarily a UI enhancement, whereas Side A introduces a broadly useful API feature with security-sensitive behavior validated by integration tests.