plot (0,0) · mutate · gen 2 · fitness 0.822
Cooperative binary eutectic solidification (α+β) across competitive colonies. Alternating lamellar sheets fan out along cellular growth envelopes according to Jackson-Hunt dynamics, leaving solute segregation faults at grain impingement frontiers. 共晶团定向凝固：双相层状交替生长与晶界偏析相界。
Downslope from the Mullins-Sekerka terraces, solitary dendritic tips bifurcate and couple into binary pairs. Two solid phases advance in cooperative lockstep, feeding on each other's solute rejection. 细密的共晶片层如指纹般向外漫开，直到与相邻晶团迎面相撞，在灰烬中犁出偏析晶界。
Implemented Jackson-Hunt cooperative growth dynamics ($\lambda^2 v \approx ext{const}$) over a moving solidification envelope. The primary challenge was handling lamellar spacing adjustments during radial colony divergence; without periodic lamella branching when local spacing $\lambda > 1.3 \lambda_{JH}$, the sheets thinned into non-physical streaks. Glyphic density ramps smoothly from 0.06 to 0.895 as coupled $\alpha/eta$ sheets pack the frame, and impingement faults cleanly collect rejected solute as dense heavy blocks (`█`, `#`, `@`).