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b0cfda3187
- Add fused single-pass spatialGradient kernels with runtime SIMD dispatch. - Add dispatched SIMD Canny edge path (canny.dispatch.cpp, canny.simd.hpp). - Route corner, Canny, and IntelligentScissors gradients through spatialGradient. - Extend spatialGradient ksize support to 1 via Sobel fallback; gate fused paths to 3/5. - Extend fused_accuracy ROI tests to ksize 1, 3, and 5 (borders, CV_16S/CV_32F).