MEON R2 V50–R50: Master Audit Report on SPARC Rotation Curves, Halo-Model Benchmarks, MOND/RAR Comparisons, and Bullet Cluster Pilot Data-Gate Tests

This release documents the MEON R2 V50–R50 audit series, a structured benchmark program testing a geometric modification framework for galactic rotation curves and related gravitational probes. The main focus is the MEON_CoreDamper_2P profile, evaluated against SPARC rotation-curve data and compared with Newtonian baryonic baselines, NFW_2P, Burkert_2P, Einasto_3P, DC14-like halo profiles, MOND, and RAR-inspired benchmarks. Across the SPARC audit stages, MEON_CoreDamper_2P remains a competitive two-parameter phenomenological model. It performs strongly against NFW_2P, MOND, and RAR-style comparisons, while more flexible halo profiles such as Burkert, Einasto, and DC14-like proxies remain important competitive baselines. Additional one-parameter geometry-lock tests show that fixing the MEON core scale directly to the optical disk scale length is too restrictive for the full SPARC sample, but remains informative as a level-playing-field comparison against one-parameter modified-gravity benchmarks. The release also includes robustness and no-cheat controls, including cross-validation, wrong-baryon tests, parameter-lock tests, and preliminary Bullet Cluster data-gate experiments. The Bullet Cluster component is intentionally reported as a pilot-stage analysis: public image-product proxy tests are not treated as calibrated lensing evidence, and the calibrated-data pipeline currently confirms Chandra X-ray data processing while requiring an external calibrated kappa/lensing map before a full Bullet Cluster conclusion can be drawn. Overall, this release should be read as a reproducible audit and model-comparison package, not as a final claim that MEON replaces dark matter. The results motivate further testing with calibrated lensing maps, galaxy-cluster datasets, and stronger parameter-prediction laws for the MEON core scale.