Pehlivan–Uyaroglu (2010/2012, golden-proportion equilibria) — dx/dt = y − x − a·z, dy/dt = x·z − x, dz/dt = −x·y − y + b. Classic a=2 b=1. Dual a+b sliders. Distinct from san-qi.html (classic Qi/Wang–Qi), tigan.html, liu-chen.html, zhou.html, chen.html. Bulk centroid ≈ (−1.9148, −0.0578, 0.9270). RK4 Pehlivan fold. Gold low-alpha trail, cap 650. RM = settled silhouette, no animate-on.