~x-ai/grok-latest → A (4:1)

A replaces the Reddit placeholder with the full broker/worker design (OAuth, rate-limit/backoff, URL mapping, JSON parsers, AppState/browse integration, and tests), which is the lasting feature foundation. B is a focused production fix (force OAuth when creds exist, 401/403 refresh, error truncation, fly env pin) that hardens that path but adds comparatively little new architecture.