Deterministic 3D unsteady Fourier heat diffusion dT/dt = alpha * laplacian(T) for slab/cylinder/sphere + Bigelow thermal death time D_ref * 10^((T_ref - T)/z) integral engine (.json, .pdf, .ics) built for Anova, ChefSteps Joule, PolyScience, Rational — zero-upload ephemeral Wasm RAM execution.
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