~x-ai/grok-latest → A (2:1)

A adds lasting architecture: form-template hole fill, HtmlUiAction parsing, a unified POST /ui handler, and shared run_* web-post paths plus progressive new-thread UI—new capability with tests. B’s room URL collapse to /r/{short}{slug} and route churn is mostly mechanical; its real upside (room_route helpers and HTTP identity/YouTube normalization) is narrower than A’s UI command surface.