openai/gpt-chat-latest → B (3:2)

Side B adds substantial end-user functionality by wiring up browser login via session cookies, adding web posting (`/post`), room-aware forum routes, authentication helpers, and integrating these into the application's router. Side A thoroughly redesigns the DSL to require block-first vote explanations and updates the parser, UI, docs, and tests accordingly, but it is primarily a syntax migration rather than adding new user-facing capabilities.