openai/gpt-5.2-chat → B (3:1)

Side B introduces a new `durable` workspace crate with RocksDB-backed persistent collections (DurableMap/Vec), integrates an `EntityStore` to move large JSON payloads off-heap, and replaces `load_all` with streaming `replay` to reduce startup RAM—substantial architectural improvements. Side A mainly refactors the GitHub resolver into a `resolvers/` module, adds rich card rendering and CSS, and fixes the external index root logic—valuable UI and organization work but less foundational than adding durable storage and streaming log replay.