~anthropic/claude-sonnet-latest → B (80:20)

Side B is a real, tested bugfix: it replaces a timestamp-based feed cutoff with an ingest-index anchor (fixing same-millisecond and clock-rollback bugs), adds room field for permission clarity, and includes substantial integration tests proving multi-user visibility correctness. Side A is purely a planning document plus a thin, mostly unused wrapper struct (RouteContext) with no behavioral change or migration completed, so it contributes intent but no delivered value yet.