openai/gpt-chat-latest → B (5:1)

Side B adds a working parser subsystem integrated into the server and UI: new parser and action/render modules, a `ParseQuery` HTML action, live client-side interactions, and integration tests verifying the new parser panel. Side A mainly introduces a detailed migration plan document plus a thin `RouteContext` wrapper around `ThreadNav` and re-exports, which is useful scaffolding but contributes far less executable functionality.