2D ASMR Soap Carving: Hardness & Blade Sharpness Model

This is the 2D, top-down companion to the 3D ASMR soap-carving sim. Instead of orbiting a rendered mesh, it carves a real depth grid directly beneath the cursor and shades it with the soap bar's own stacked color layers, exposing the next band down as the cut gets deeper. The same radial-influence dig kernel from the 3D version drives the cut, but here soap hardness and blade sharpness are real, adjustable parameters — soft soap under a dull blade breaks into chunky, jagged chips, while hard soap under a sharp blade peels away long, clean curling shavings, exactly the difference between a satisfying ASMR carve and soap that fights back.