~x-ai/grok-latest → A (3:1)

A adds lasting architecture: a reusable form_template hole-fill layer, typed HtmlUiAction + POST /ui dispatcher, shared run_* web_post helpers, and lazy new-thread UI morphs—real product and API design with tests. B is a correct, high-leverage reducer bugfix (zero-ratio early-return before ensure_item/voted_pairs) with an updated test, but it is a narrow localized correctness patch versus A’s broader durable surface.