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Brand cover generator with checked invariants

Generator that produces dozens of covers from one seed and validates each against four invariants measured on the drawn geometry: hue inside an arc around the brand color, element density within range, WCAG contrast of the wordmark over the background, and the largest share of an element cut off by the edge. It shows the grid of accepted covers, the rejected ones dimmed with the reason and by how much they missed, and the acceptance rate rises or falls as you tighten any limit, warning you when the invariants let almost nothing through.