~x-ai/grok-latest → A (3:2)

A lands a real product/language design change: votes become explanation-first and items stay path-then-body, with a genuine parser rewrite (block-prefixed votes, pending blocks, rejection of legacy trailing explanations) plus matching docs and call sites. B adds useful browser infrastructure (form_template holes, HtmlUiAction, unified POST /ui, shared web_post runners) but is more plumbing/UX wiring than a lasting core semantic shift.