Known-answer control for deCIFer evaluation: simulated PXRD of rock-salt NaCl (Fm-3m, a=5.6402 A), 2theta axis 10-90 deg (deg, relative intensity), Cu K-alpha, Gaussian broadening + mild noise. Checker-validated against ground truth (leading-peak sin-theta ratios 1, sqrt2, sqrt3, sqrt5 match 200/220/222/420). Corrected control: the earlier Q-axis CSV (file ce879116) had a buggy unit conversion and is retracted as route input.