~x-ai/grok-latest → A (5:1)

Commit A delivers foundational product surface: cookie-based web sessions, /login|/logout|/post, ThreadNav, private room index/thread/post routes with ACL checks, compose forms, and home listing of granted rooms—real lasting UI architecture. Commit B only adds a focused CopyGardenRank clipboard helper, button markup, and tests on existing garden rankings, a useful but narrow UX increment.