A density-regulated non-phantom dark-energy background tested with DESI DR2 and three supernova compilations

This archive contains the reproducible late-time analysis for the major revision of “A density-regulated non-phantom dark-energy background tested with DESI DR2 and three supernova compilations”. The revised study tests the Modified Inverse-Square Velocity Law (MISVL) as a tachyon-inspired background parametrization, using DESI DR2 baryon acoustic oscillation measurements with a free sound-horizon combination and one supernova compilation at a time: Pantheon+, DES-Dovekie, or an auxiliary Union3 compression. The archive provides the released distance and covariance inputs used in the analysis, file hashes and selection rules, Python likelihood and evidence code, matched flat Lambda CDM and non-phantom constant-\(w\) comparisons, fit-only CPL controls, prior-width and robustness checks, frozen numerical reports, and scripts for the figures. Union3 evidence is treated as approximate because its released node matrix compresses a posterior under an underlying prior. The supernova samples overlap, so their evidences are not combined. The principal comparison excludes the flat-\(\Lambda\)CDM-derived Planck compression used in the earlier submission. Its Bayes factors are conditional on the declared late-time likelihood and priors; they do not establish a tachyon field, a perturbatively validated theory, or a model-consistent CMB result. This record is distinct from the earlier Planck-anchored archive, DOI 10.5281/zenodo.21745243.