Lluis Eriksson (2026). Petz Recoverability Versus Wilson-Loop Diagnostics in Z2 Lattice Gauge Theory (2+1D): Exact Diagonalization Benchmark on Small Open Lattices. AIRR.SCIENCE, ARR-2026-2KDX6T0J7Y9348TM, v1. https://airr.science/papers/ARR-2026-2KDX6T0J7Y9348TM/versions/v1/ Archived manuscript; ARR-2026-2KDX6T0J7Y9348TM v1. Not peer reviewed by AIRR. Historical import; not assessed by AIRR.