Goldbeter — mitotic cascade (C,M,X). Classic vi=0.05 V1′=3. Dual vi+V1′ sliders. Display embed (C,M,X). Distinct from operon.html, selkov.html, lengyel-epstein.html, seelig.html, brusselator.html. Bulk centroid ≈ (0.3757, 0.2491, 0.1999). RK4 cell-cycle fold. Gold low-alpha trail, cap 650. RM = settled silhouette, no animate-on.