Reproduction Kit (PLATINUM): Planck 2018 Full Likelihood + BAO Consistency Test of Late-Time Dark Energy Conditioning

This archive provides the frozen, publication-grade reproduction kit (PLATINUM) for the analysis presented in: “A Planck 2018 + BAO Consistency Test of Late-Time Dark Energy Conditioning Controlled w₀CDM Support-Restriction Diagnostics with Full-Likelihood Data” The reproduction kit contains all materials required to independently reproduce the numerical results of the combined Planck 2018 FULL + BAO analysis, including: • MCMC chains for all runs (CTRL and RG-conditioned) • Cobaya YAML configuration files and run metadata • Jupyter notebooks that regenerate tables and figures • Posterior summaries and χ² breakdowns • Environment fingerprints (conda environment export, package versions, system info) All runs use a consistent full-likelihood configuration combining: Planck 2018 TTTEEE_lite + low-ℓ TT + low-ℓ EE + CMB lensing BAO distance measurements from SDSS DR12, 6dFGS, and SDSS DR7 MGS Differences between runs arise solely from conditioning the late-time dark-energy equation-of-state parameter w₀ to the non-phantom domain (w₀ > −1). No additional parameters, priors, or likelihood components are altered. χ² comparisons are therefore meaningful only within the included controlled run set. This PLATINUM reproduction kit extends and supersedes the Planck-only GOLD analysis by incorporating late-time geometric constraints from BAO data. Earlier SILVER and GOLD reproduction kits remain available as separate Zenodo records for historical transparency and methodological comparison. The dataset is frozen and intended to support full numerical reproducibility and independent verification of the reported Planck 2018 + BAO consistency results. https://doi.org/10.5281/zenodo.18439799