openai/gpt-chat-latest → B (3:2)

Side B introduces a substantial architectural improvement by moving large entity payloads out of in-memory structures into a RocksDB-backed `EntityStore` and changing event log startup from loading the entire log to streaming replay via `EventLog::replay`, reducing memory usage and improving scalability. Side A contains a real bug fix for the external garden index (`external_root_host_items`) and adds richer GitHub import card rendering with resolver modularization, but much of the patch is UI, rendering, and refactoring rather than a foundational runtime improvement.