MEON-R2 V3 Final Audit: Planck-2018 CMB Likelihood, Level-2 Residual Scanner, and SPARC Rotation-Curve Tests

This package presents the V3 final audit of the MEON-R2 model against two independent observational regimes: Planck-2018 CMB likelihoods and SPARC galaxy rotation curves. The CMB part uses Planck PR3 low-l TT, low-l EE, high-l Plik-lite TTTEEE, and lensing likelihoods together with CAMB/Cobaya and direct clik checks. The MEON-R2 Level-2 construction is tested as a small closed residual deformation around the LCDM CMB limit. In the direct Planck delta-chi2 scan, the combined MEON-R2 residual mode remains below Delta chi2 = 1 up to a coupling scale of approximately 750 in this implementation. The SPARC part uses a deduplicated rotation-curve sample with 3391 data points from 175 galaxies. Earlier unbounded beta fits that produced beta values near 18–20 are rejected as non-reportable runaway solutions. The V3 audit therefore uses only beta-guarded or beta-fixed models: beta = 0.3 fixed, globally bounded beta, and closure-based bounded beta. In this run, the best SPARC model by AIC is MEON_closure_beta_guarded with chi2 = 46771.61, AIC = 46789.61, BIC = 46844.77, and beta = 0.15976. The MOND/RAR one-parameter benchmark gives chi2 = 50510.59 on the same deduplicated data set. The results indicate that MEON-R2 is not ruled out by the previous beta runaway; that runaway was a nonphysical fit freedom or implementation artifact. The reportable candidate is the closure/beta-guard version of MEON-R2. The CMB sector is Planck-compatible in the small Level-2 residual regime, while the SPARC sector shows competitive performance against a MOND/RAR benchmark under the stated effective-error and nuisance-model assumptions. Weak-lensing spin-shear tests are not claimed here because a real spin-signed lensing data set was not included in this audit.