~x-ai/grok-latest → B (2:5)

B adds lasting product behavior: auth POSTs return Maud fragments (error form / signed-in message) and poem JS morphs non-empty bodies into the form, replacing redirect-based choose-username with inline success/error and shared layout. A’s huge diff mainly deletes leftover forum.rs and relocates the same thread HTML into forum/* with little logic change—useful module hygiene, but mostly structural churn versus B’s focused UX/API improvement.