openai/gpt-chat-latest → A (4:1)

Side A adds a new end-to-end capability: a RoomList RPC, CLI `room list` subcommand, shared request/response types, server implementation that filters rooms by authenticated principal's grants, and integration tests verifying per-user isolation and grant behavior. Side B primarily changes DSL syntax from trailing to leading vote explanations, updating the parser, UI generation, documentation, and many fixtures/tests to match; while substantial, it is largely a syntax migration rather than introducing comparable new functionality.