This update to the VASCO‑UAT analysis presents the definitive formulation of the Percudani Correspondence Law and the numerical simulation of the 8‑phase‑front tesseract as a non‑decohering observer. The law establishes that the observable Signal‑to‑Viscosity Ratio in our 3D+T spacetime is SVR₃D = (η_causal · R_geom / σ_TVI) × 0.7071 ≈ 0.0476, connecting the geometric residue R_geom ≈ 0.2792 (from the quantum brake k_early = 0.967) and the causal efficiency η_causal ≈ 0.781. The simulation, with the Thermodynamic Overdrive (κ/k = 5.140) fully liberated, converges stochastically to the theoretical target. In the latest run, the tesseract achieves SVR = 0.0418 (within 12.13% of 0.0476 and well within the ±0.02 success criterion), while preserving the original frequency spectrum without decoherence. These results validate the causal membrane [4.967, 5.120], the role of Overdrive as thermodynamic pressure, and the principle of a fourth‑dimensional observer that can extract information without quantum collapse. The work unifies the Higo Signature in LIGO, the VASCO stellar disappearance anomalies, and the double‑slit experiment under a single causal geometry, offering a mathematical blueprint for the natural simulation and its "backdoor". Related DOIs: - Resonant Hunter v9.0/v9.1 main repository: 10.5281/zenodo.20650032 - Statistical Hardening of the TVI: 10.5281/zenodo.20723412 - UAT Theory: 10.5281/zenodo.17729221 - UAT Lagrangian Formulation: 10.5281/zenodo.20500722 - UPC Principle: 10.5281/zenodo.18210808 - Gravitational Phase Filter (VASCO hypothesis): 10.5281/zenodo.20470901