This record archives the reproducibility package for the FCLET-K1 Planck 2018 full-likelihood response posterior confrontation. It includes the converged ΛCDM baseline posterior package, the converged FCLET-K1 response posterior package, YAML configurations, raw logs, chain files, convergence diagnostics, SHA-256 manifests, posterior summaries, and model-comparison reports. The ΛCDM baseline posterior converged with R-1=0.009094. The FCLET-K1 response posterior converged with R-1=0.005755 and R_cl-1=0.048200. The best CMB-fit difference relative to the ΛCDM baseline is Δχ²≈+0.3461. This archive does not constitute a Bayesian evidence claim. A full Bayesian evidence statement requires a separate nested-sampling/evidence run. Official Planck likelihood/data products and third-party software are not redistributed in this archive; reproduction instructions point to the official Planck, CLASS, and Cobaya sources.