openai/gpt-chat-latest → B (9:1)

Side B introduces substantial new functionality and architecture: explicit user-triggered Reddit entity fetching, persistent `EntityImported` events with replay support, storage of raw API payloads plus derived views, configurable API endpoints, and associated UI, tests, and fixtures. Side A only removes a now-redundant zero-ratio guard in `apply_vote` and updates a test to reflect that zero-weight edges are skipped while items are still registered, which is a small cleanup compared with B's lasting feature additions.