ECTI-P vs ΛCDM — Full Likelihood (CLASS + Cobaya) FAIR Comparison with Planck 2018, Pantheon+, DESI BAO, RSD, KiDS-1000, and DES Year 3

Update v1.2: - Added DES Year 3 (DESY3) weak-lensing full-probe analysis- Added updated full-likelihood MCMC chains and covariance matrices- Added modified CLASS implementation (classy_ecti_bgonly)- Added full Cobaya/Cosmosis configuration pipeline used in the DESY3 analysis This dataset contains the full-likelihood CLASS + Cobaya analysis pipeline used for the FAIR comparison between ΛCDM and the ECTI-P late-time deformation framework. The analysis combines: - Planck 2018 TT/TE/EE- Pantheon+ Type Ia Supernovae- DESI 2024 BAO- BOSS/eBOSS RSD- KiDS-1000 weak lensing- DES Year 3 weak-lensing constraints Key full-probe DESY3 results (MAP): - Δχ² = −15.686 (ECTI-P − ΛCDM)- H₀: 71.32 vs 68.34 km/s/Mpc- S₈: 0.795 vs 0.811 ECTI-P is a minimal phenomenological late-time deformation of ΛCDM designed to modify the low-redshift expansion history while preserving the standard early-Universe behavior. The implementation used in this release follows a hybrid approach: - Modified background expansion (ECTI-P)- Standard ΛCDM perturbation sector The improvement is driven primarily by Pantheon+ Type Ia supernovae, with additional contribution from weak-lensing probes, while the CMB likelihood degradation remains moderate and BAO penalties remain limited. This release includes: - converged MCMC chains- covariance matrices- Cobaya YAML configurations- modified CLASS implementation- likelihood interfaces- full reproducibility files used for the published analysis Associated GitHub repository:https://github.com/f-patellis/ECTI-P_CLASS_fullprobe_vs_LCDM Associated paper:"Full-Likelihood Constraints on a Minimal Late-Time Deformation of ΛCDM: The ECTI-P Framework"