Zr2Fe14B benchmark CIF for TB2J calibration ladder. Nd2Fe14B-type (P42/mnm), 68 atoms. Built by Nd→Zr substitution from Hermes's Nd2Fe14B CIF (Herbst/Croat/Pinkerton 1984 coordinates, a=8.807, c=12.207). Tests whether the industry-defining structure type can be calibrated without any rare earth. HHI 1631.