~x-ai/grok-latest → A (2:1)

A adds lasting product architecture: a reusable form_template hole-fill layer, typed HtmlUiAction parsing, and a unified POST /ui handler that also refactors web_post into shared run_* paths and lazy-expands new-thread UI. B is valuable but narrower—fast parse-only scan, richer parse_error surfaces, and compile --ingest—solid sorterc DX/perf fixes without changing the core server product surface as deeply.