openai/gpt-chat-latest → B (9:1)

Side B makes a substantial architectural improvement by introducing a RocksDB-backed `durable` workspace crate, moving raw entity JSON out of `GlobalTree` into a persistent `EntityStore`, and replacing event-log bulk loading with streaming `replay()` to reduce startup memory usage. Side A is a focused UI correctness fix that changes rank highlighting to be computed per ranking group instead of globally and adds regression tests, but its impact is much narrower than the persistence and scalability changes in Side B.