~x-ai/grok-latest → B (1:8)

B delivers lasting infrastructure: vendoring a RocksDB-backed durable crate, moving full Reddit entity JSON out of in-memory GlobalTree into entity_db, and streaming event-log replay line-by-line to cut startup RAM—plus wiring EntityStore through import/replay paths. A is a focused UX polish (clickable unpin in ranked child rows with CSS/tests) that reuses an existing set_garden_pin flow and does not change core storage or scalability.