~x-ai/grok-latest → B (1:8)

B removes EntityImported/EntityStore entirely, keeps only NodeEnsured in the durable log, and adds TTL eviction for ephemeral Reddit display content—fixing retention policy, log bloat, and rebuild semantics across journal, projection, storage schema, and reddit import. A only retunes rank-row gradient math from list ordinal to per-group min–max score, a correct but narrow UI polish.