~x-ai/grok-latest → A (3:1)

A redesigns canonical identity around UUID-only principals with multi-provider OAuth linking (including full Reddit OAuth, conflict handling, private linked-provider UI, trust-weight batch fixes, and test mocks)—foundational auth architecture. B adds a solid but narrower UX feature: optional pool-scoped pair selection and threading pool through vote navigation/UI, without comparable system-level depth.