~x-ai/grok-latest → B (1:8)

B lands a full GitHub OAuth/session/pseudonym stack, gates votes on real identity, projects PrincipalCreated/OauthLinked/PseudonymClaimed into durable maps, and extracts the in-tree durable crates to an external git dep—durable product and architecture. A mostly adds plan.md plus a thin RouteContext wrapper still delegating to ThreadNav/CanonicalItemUrl, so it stages a refactor rather than delivering lasting behavior.