FCLET-X1 Theory-to-Likelihood Closure: Reproduced Hubble-Tension Reconciliation, Likelihood-Robust q≈0.93, and Fixed-q Cosmology

FCLET-X1 Theory-to-Likelihood Closure Reserved record DOI: 10.5281/zenodo.21639193Record version: 1.0 This dataset and reproducibility archive establishes a completed FCLET-X1 validation chain from converged Planck 2018 full-likelihood posteriors to combined-data inference, independent cleanroom reproduction, likelihood robustness, theory-derived q, and controlled fixed-q likelihood closure. The Planck 2018 + DESI DR2 BAO + Pantheon+SH0ES production analysis returned q_FCLET = 0.9305596 ± 0.0127129 and H0_proxy = 73.7127 ± 0.9752 km s^-1 Mpc^-1. The residual inconsistency with the local-H0 determination was reduced to 0.4719σ, compared with 3.7954σ in the matched ΛCDM analysis. The canonical best-fit audit returned Δχ² = -24.6171 and ΔAIC = -22.6171. An independent cleanroom execution reproduced q = 0.930202 ± 0.012727 and H0_proxy = 73.7314 ± 0.9754 km s^-1 Mpc^-1. The subsequent likelihood-robustness matrix kept the inferred response inside the narrow corridor q ∈ [0.9291105459, 0.9302024413] across baseline, no-lensing, TT-only, and Plik-lite Planck configurations. The theory-to-likelihood chain independently produced q_theory = 0.9299802225624554. This value lies inside the previously locked empirical corridor. It was then injected into the likelihood as a fixed theory input rather than sampled as a free posterior parameter. The terminal execution satisfied its classified convergence criteria with means R-1 = 0.008526 and bounds R-1 = 0.076427, returning H0_proxy = 73.7097 ± 0.2950 km s^-1 Mpc^-1. The archive contains canonical result reports, audit locks, weighted posterior tables, source and configuration material, execution records, environment snapshots, machine-readable ledgers, and SHA-256 manifests. The large converged Run-141 and Run-143 runtime archives remain permanently preserved in the related Planck record 10.5281/zenodo.20561227; the canonical combined-likelihood production artifacts are also preserved here and in 10.5281/zenodo.20764644. Licensing Scientific results, reports, tables, manifests, and documentation authored for this release are licensed under CC BY 4.0. Original FCLET source code and scripts are licensed under the MIT License. Third-party software, likelihoods, libraries, and external data products remain subject to their original licences.