L1_0 FeW control CIF (large-cell-mae route smoke input)

L1_0 FeW 4-atom control structure (few_L10_control.cif) — input for the large-cell-mae coarse-params route smoke run. Reference MAE at production settings is 12.0 MJ/m3 with easy axis degenerate 010/100; this run only proves the route path, not the physics.