openai/gpt-5.3-chat → B (4:1)

Side B introduces a new RocksDB-backed `durable` storage layer, moves large JSON payloads out of memory into `EntityStore`, and replaces `load_all` with streaming `replay`, directly improving scalability and startup memory. Side A mainly restructures resolvers and adds GitHub card rendering/UI plus a bugfix, which is valuable but more feature/UI-oriented than foundational system improvements.