Show HN: r3, A local alternative to Claude Artifacts

Hi HN, author here. r3 is a tool originally built for reviewing code changes and design doc. I recently revamped it to better support html artifacts, similar to claude artifacts, but running locally and for all agents. This reflects a shift in my daily workflow: I now prefer html design doc over markdown for its richer layout and interactivity. I'd love to hear your thoughts on it!