~x-ai/grok-latest → A (3:2)

Side A introduces a complete, lasting URL subsystem (DFA graph traversal, GraphBuilder validation, host/path absorb patterns, generic fallback, encode-safe canonicals, and dense equivalence/breadcrumb tests across Reddit/YouTube). Side B is a solid identity/auth extension (UUID-only principal, multi-provider link semantics, Reddit OAuth paths, pending-weight batching) but largely builds on the existing OAuth/session model rather than a new core domain design.