~x-ai/grok-latest → B (3:1)

B adds lasting UI architecture: a tested form_template hole-fill layer, HtmlUiAction + parse path, POST /ui dispatch, and shared web_post runners, enabling progressive form expansion rather than only refactoring existing endpoints. A is a sound but narrower storage cleanup (Deque→List/Vec, drop write-time trim_recent_votes, cap on read + one test) that simplifies projections without introducing comparable new capability.