openai/gpt-chat-latest → A (5:1)

Side A makes a substantial architectural change: it introduces a RocksDB-backed `durable` workspace crate, moves raw Reddit entity JSON out of the in-memory tree into a persistent `EntityStore`, and replaces startup's `load_all()` with streamed event-log replay via `EventLog::replay`, reducing memory usage while preserving functionality. Side B is a valuable operational bugfix that requires OAuth when configured, refreshes tokens after 401/403, and avoids fallback to blocked public endpoints, but its scope is limited compared with Side A's long-term persistence and scalability improvements.