🦔 Nine-Banded Armadillo Burrow Lab: Soil Heat Diffusion, Damping Depth and the Thermoneutral Energy Budget

Cut open the ground and watch heat diffuse into the soil: a Crank-Nicolson model of daily and seasonal temperature waves, a colour-coded 3D section with burrow and chamber, and an armadillo whose energy budget and fat reserve depend on burrow depth, climate and foraging hours. Five numerical checks.