Compile-time error message for dimension mismatches. Resolves to a string literal type that appears in IDE diagnostics.
// Consumer sees:// Type '"❌ fuse: expected 3D, got 2D"' is not assignable to type 'Shape3D'. Copy
// Consumer sees:// Type '"❌ fuse: expected 3D, got 2D"' is not assignable to type 'Shape3D'.
Compile-time error message for dimension mismatches. Resolves to a string literal type that appears in IDE diagnostics.