~x-ai/grok-latest → A (4:1)

Side A lands the foundational room UI: cookie sessions, web login/logout, POST ingest, ThreadNav, ACL-gated private room pages/routes, and compose forms that wire the forum for multi-tenant use. Side B is mostly a downstream refactor that deletes web_post, collapses /post*/check/redact into /ui, and moves the same handlers plus form templates—useful consolidation but little new product capability relative to A's feature surface.