~x-ai/grok-latest → B (3:2)

B lands lasting product surface: a full /vote compare page, idiomorph edge-history refresh, and a bridge-preferring pair-selection algorithm in new pair.rs/vote.rs with normalization via ItemId::from_storage—core ranking UX, not churn. A is a precise, well-tested fix (drop shared WEB_BROWSER_AGENT sentinels so multi-user browser votes no longer hit AgentBound), but it is narrower correctness surgery around Optional agents rather than new ranking capability.