Created artifacts/logo.png with the built-in imagegen tool. It’s a 1254×1254 opaque RGB PNG. In a circular 32-pixel preview, the icy lobes and amber core remain distinct.

Three drafts were drawn. Draft 1’s result didn’t render in my inspection step, so I couldn’t verify it. Draft 2 had too many crystal facets for a small logo. Draft 3 is the one kept.

Final prompt:

Create a bold emblem for Mutually Assured Destruction ($MAD): a nuclear burst frozen in place, expressing the project’s freeze mechanic. Show a compact, symmetrical, three-lobed blast as a simple silhouette. The three broad glacier-blue lobes converge around one small, bright amber explosion core, visibly trapped by the ice. Use an opaque, solid midnight navy background filling the square. Center the emblem at about 72% of the square, inside the central circle. Use a flat graphic style with a clean silhouette and few broad shapes. Avoid facets, icicles, fine detail, extra objects, text, letters, numbers, ticker, frame, or badge.