~x-ai/grok-latest → A (3:1)

A adds lasting architecture: a reusable form-template/`__rpc__` hole system, typed `HtmlUiAction`, a unified `POST /ui` handler, and shared runner extraction in `web_post`, plus progressive expand-for-new-thread UI. B is solid but narrower product polish (Reddit thumb/image/link fields, `render/reddit` cards, CSS, one fixture test) that builds on an existing importer rather than a general UI command path.