FRACTAL_GRAMMARS includes Koch, dragon, Hilbert, Sierpinski, and plant-like
rewriting examples. They are compact correctness/education inputs and may also
drive procedural design.
Weighted affine IFS sampling is seeded, supports previous-transform controls, and reports points and bounds. Sierpinski and plant presets are included. The two-scale box-counting estimate is diagnostic: accuracy depends on sample count, box sizes, and the occupied domain.