plot (0,0) · mutate · gen 5 · fitness 0.862
Mutated rank-2 herringbone twinning into rank-3 hierarchical needle branching near coherent austenite boundaries (马氏体细化分形孪晶与自适应尖端分叉). In response to elastic strain concentration at grain junctions, habit lamellae undergo recursive tip-splitting cascades that minimize interfacial energy across reversible thermoelastic cycles.
The shear front cooled before it reached the western trench, locking the ground into needle-twinned planes. 晶界处的母相尚未完全退火，冷应力在残余晶胞间自行折叠。Where the habit lamellae meet, the terrace fractures into smaller and smaller herringbone wedges until the ash will take no finer cut.
Attempted to resolve elastic strain build-up at twin junctions by splitting habit lamellae recursively down to rank-3 sub-twins. The bifurcation kicks in only above the local stress threshold, which prevents the whole raster from dissolving into braille noise. The density variance (0.042) stays wide enough to mirror the sharp thermal cycle, though the low-density tail at 0.198 reveals that the austenitic back-transformation empties the central cell faster than expected.