Vallis El Niño (1986/88) — dx/dt = B·y − C·(x + u*), dy/dt = x·z − A·y, dz/dt = −x·y − A·z + A·R. Fixed A=0.25 u*=0.5 R=1. Classic B=102 C=3. Dual B+C sliders. Distinct from sakarya.html, pehlivan.html, tigan.html, liu-chen.html. Bulk centroid ≈ (−0.1126, 0.0113, 0.0211). RK4 Vallis fold. Gold low-alpha trail, cap 650. RM = settled silhouette, no animate-on.