~x-ai/grok-latest → B (3:2)

B replaces a Reddit fetch stub with a lasting broker/worker (OAuth, rate-limit backoff, dedup/TTL, JSON mapping/parsing, browse/ensure_path hooks), which is foundational product capability. A meaningfully improves core pair selection (attach-isolate before isolate-isolate, then rank-adjacent zip) with solid tests, but it refines an existing path rather than delivering a new end-to-end subsystem.