openai/gpt-chat-latest → A (4:1)

Side A introduces a substantive new asynchronous fetch flow: it adds an SSE-based entity import pipeline, streams fetch progress and completion to the UI, wires Reddit fetch completion through oneshot notifications, and updates the browser client to consume event streams instead of only JavaScript responses. Side B mainly exposes an existing room-creation capability through the CLI while simplifying the data model by removing room visibility, but most changes are API cleanup, documentation, and plumbing rather than adding comparable runtime functionality.