~x-ai/grok-latest → B (2:5)

B is a lasting identity redesign: optional naked delegates, strict no-@ wire form, identity/canonical_path split, and a reducer that stops rewriting principals—foundational across ingest, APIs, CLI, and HTML. A is a high-value but narrower follow-on bugfix (drop shared WEB_BROWSER_AGENT sentinels, Option agent on pending sessions, multi-user vote test) that depends on that model rather than establishing it.