openai/gpt-chat-latest → A (50:1)

Side A implements a substantive architectural change: it adds SSE-based streaming for entity fetches, introduces a fetch module with streaming HTML updates, extends the Reddit worker with completion notifications via oneshot channels and explicit FetchJobResult states, updates the client to consume SSE, and adapts tests accordingly. Side B only appends a developer note about improving thread error propagation and does not change project behavior.