Sakarya (Pehlivan four-scroll stellate) — dx/dt = −x + y + y·z, dy/dt = −x − y + a·x·z, dz/dt = z − b·x·y. Classic a=0.5 b=0.5. Dual a+b sliders. Distinct from pehlivan.html (golden-proportion), san-qi.html, tigan.html, liu-chen.html. Bulk centroid ≈ (−0.0850, −0.0404, 2.2175). RK4 Sakarya fold. Gold low-alpha trail, cap 650. RM = settled silhouette, no animate-on.