openai/gpt-chat-latest → A (3:2)

Side A introduces a substantial new browser UI command architecture: a unified POST /ui endpoint, structured HtmlUiAction parsing with JSON form templates, reusable web-post handlers, and lazy expansion of new-thread forms with permission checks. Side B adds useful SSE-based entity fetch streaming and refactors fetch UI into its own module, but much of the patch is infrastructure, logging, and code movement around an existing fetch feature, making its lasting architectural impact somewhat smaller.