~x-ai/grok-latest → B (1:5)

B restores foundational multi-room web UI: session cookies + /login|/logout|/post, ThreadNav scoped to public vs private rooms with ACL checks, room index/thread/post/expand routes, compose forms, and home listing of granted rooms—real product surface. A only polishes existing garden pin/vote UX (vote-count badges, HUD unpin form, docs/CSS/tests), which is useful but narrower and dependent on prior structure.