feat: bicubic resize (Catmull-Rom) - #69
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Adds Image::resize_bicubic(w, h): Catmull-Rom cubic over a 4x4 neighborhood, center-aligned sampling, clamp-to-edge, overshoot clamped to 0..255, alpha interpolated. 4 new tests: same-size identity (weights collapse to 0,1,0,0), flat-field fixed point at 3 scales, step upscale produces intermediate values unlike nearest, degenerate sizes clamp to 1x1. 151/151 tests passing. Closes #66