Malasoma — dx/dt = y, dy/dt = z, dz/dt = −a·z + k·y² − x. Classic a=2.017 k=1.0. Dual a+k sliders. Distinct from shimizu-morioka.html, anishchenko.html, vallis.html, sakarya.html, pehlivan.html. Bulk centroid ≈ (0.5040, 0.2669, 0.2734). RK4 Malasoma fold. Gold low-alpha trail, cap 650. RM = settled silhouette, no animate-on.