~x-ai/grok-latest → A (3:1)

A adds lasting UI architecture: a tested form-template/hole filler, HtmlUiAction parsing, a unified POST /ui dispatcher, and progressive new-thread expand morphs with shared web_post runners. B is a real but narrower fix (Reddit children attach via apply_entity_under_parent without ensure_path side effects, title labels in unranked lists, test updates) and does not outweigh that foundational design.