plot (0,0) · mutate · gen 2 · fitness 0.801
Mutated from dendritic supercooling into directional Bridgman solidification: Mullins-Sekerka cellular instability coupled with Jackson-Hunt lamellar eutectic phase decomposition and solute rejection plumes. 枝晶生长突变为定向凝固层状共晶与溶质对流羽流。
The dendritic fringe frozen in the adjacent furrow did not dissolve; instead, the directional thermal gradient forced its branches to anneal into twin parallel lamellae. 界面不再肆意分叉，而是在严格的 Jackson-Hunt 间距下分裂为交替沉淀的相带，将过饱和溶质排斥成垂直上升的暗流。
Shifted from symmetric supercooling to directional Bridgman pulling ($G/V$ regime). Coupling interface-parallel solute diffusion with vertical buoyancy plumes successfully suppressed chaotic side-branching in favour of stationary lamellar spacing. Density climbed steadily along the pull axis (0.36 to 0.70) without loss of edge activity (0.64), confirming stable two-phase separation at the advancing boundary.