Repressilator — dx/dt=α/(1+zⁿ)−x, dy/dt=α/(1+xⁿ)−y, dz/dt=α/(1+yⁿ)−z. Classic α=10 n=3. Dual α+n sliders. Display embed (x,y,z). Distinct from operon.html (Goodwin chain), goldbeter.html, wilson-cowan.html. Bulk centroid ≈ (2.5432, 2.5453, 2.5411). RK4 genetic ring fold. Gold low-alpha trail, cap 650. RM = settled silhouette, no animate-on.