openai/gpt-chat-latest → B (5:1)

Side B implements substantial new functionality: it replaces automatic Reddit fetches with explicit user-triggered imports, persists full upstream payloads via a new `EntityImported` event for replay, updates the reducer to store raw payloads plus derived views, and adds configuration, tests, and UI support for the workflow. Side A mainly adds a detailed planning document and introduces a thin `RouteContext` wrapper re-exported from the HTML module, which is useful for future work but does not materially change project behavior yet.