38473f3fa5
math.Span.cs adds the analytic Hessian of snoise(float3) on snoise_grad's tied kernel and the closed-form integral of a clamped linear ramp; HLSL twins and the Unity copies follow, HessianNorm now reads the library Hessian, the GLSL lowering gains float3x3 to mat3, and MeasureThird/ThirdConstantPinsSampled and SpanPrimitiveTests land. SNOISE_THIRD is a placeholder (1) until MeasureThird runs; CultMath.glsl and the fixture are not yet regenerated. Does not pass its tests. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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