~x-ai/grok-latest → B (2:5)

B adds foundational multi-user auth (GitHub OAuth, sessions, pseudonym claims, identity event projection, and vote gating) plus integration tests, which the product needs for accountable votes. A is a strong but narrower improvement: better bridge/isolate priority and rank-zip pair selection in pair.rs with focused unit tests. Much of B’s diff is relocating durable out of tree (deletion noise), so A still earns solid weight, but auth is the larger lasting capability.