UCT Prediction 2 (Stage 2): Platform-Specific Pre-Registration for IBM Fez Z_2^3 Test

Stage 2 platform-and-execution lock for the (Z_2)^3 branch of the UCT compression-interface theorem at d = 3 / m = 3, to be tested on IBM Fez. Companion to Stage 1 (DOI 10.5281/zenodo.20360004) and Stage 1b (DOI 10.5281/zenodo.20360259). Locks: backend = ibm_fez; qubits = [15, 25, 56]; calibration epoch = 2026-05-23T21:39:41Z (calibration CSV SHA-256 ca91f71a3e81d97e51c082ea95326f222963c6186ac1b470bb3495aac1901c4a); analysis script uct_d3_fez_test.py SHA-256 69e5f1dd042f53545e10102d1a14e2d8a3c34