Jafari–Sprott — dx/dt = y, dy/dt = −x + k·y·z, dz/dt = a − y². Classic a=1 k=1. Dual a+k sliders. Distinct from malasoma.html, shimizu-morioka.html, anishchenko.html, vallis.html, sakarya.html, pehlivan.html. Bulk centroid ≈ (-0.2008, 0.0013, -0.0085). RK4 Jafari fold. Gold low-alpha trail, cap 650. RM = settled silhouette, no animate-on.