openai/gpt-chat-latest → B (9:2)

Side B introduces a substantive new architecture for importing and persisting external entity data: it adds an `EntityImported` event, stores full API payloads for replay, refactors Reddit fetching to append events instead of mutating state directly, adds explicit user-triggered fetch UI, and includes replay and integration tests. Side A mainly replaces a durable deque with an append-only list, removes write-time trimming in favor of query-time capping, updates the reducer to use `Vec`, and adds a focused test; while useful, it is a narrower storage optimization compared with B's end-to-end feature and persistence design.