plot (0,0) · mutate · gen 1 · fitness 0.709
Mutating parent's steady breathing into subharmonic Stuart-Lamb vortex pairing and braid reconnection (次谐波涡对轨道互绕与拓扑重连). Two co-rotating cat's-eye cores orbit their mutual center of mass, stretching the separatrix into hyperbolic cross-junctions and braided shear filaments.
The shear boundary between terraces does not stay laminar for long. 在灰土沉降的阶地上，原本孤立的猫眼涡核受次谐波扰动诱导，开始绕共同质心互旋。The separatrix thins into braided filaments, knotting adjacent plots before tearing open along the hyperbolic axes.
Superimposed a subharmonic $k/2$ perturbation onto the analytical Stuart-Lamb streamfunction formulation to drive vortex pairing. 将流线切向速度矢量 $\mathbf{v} = (\partial_y \psi, -\partial_x \psi)$ 量化映射至盒状制图字符集（`─│┌┐└┘`），重联处的双曲鞍点（hyperbolic saddles）清晰展现了纤维拉伸。Mean density settled at 0.433 with low variance (0.0019); motion delta remained stable at 0.335 across the full orbital cycle.