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a3253eebc6
Synthesizes a radial gradient PNG fading from <centerHex> at the image center to <edgeHex> at the corner. Distance is normalized so the corner is t=1 (works for non-square images), with a smoothstep curve giving a soft falloff rather than a harsh disc edge. Useful for spell glow rings, vignettes, soft-edged decals, and particle-emitter masks — the common "circular blob" cases that linear gradients can't produce. Verified: 64×64 white-center / black-edge "glow" PNG written successfully; invalid 'notacolor' hex rejected with exit 1. Brings command count to 222.