The trace is the UI
An assurance tool's most valuable interface is portable evidence, not an app. Evarness renders a graph, a run, and its verdicts into one self-contained HTML file — the event-sourced trace is the animation feed, the digest in the header is recomputable from the file alone, and the file itself obeys the product's own honesty rules. This post is the design argument, and every claim in it links to an artifact this site's build just generated and checked.