A Three-Regime Consistency Test of the Enchan Field: CDM-like CMB Persistence, Galactic Low-Acceleration Enhancement, and Solar-System Newtonian Recovery

This record contains the manuscript and complete reproducibility package for “A Three-Regime Consistency Test of the Enchan Field: CDM-like CMB Persistence, Galactic Low-Acceleration Enhancement, and Solar-System Newtonian Recovery.” The study tests whether the Enchan Field can consistently occupy three observational regimes that normally place very different requirements on gravitational models. At CMB scales, independent 3D matter-free Enchan-field simulations show spontaneous structure formation followed by finite-tension saturation and persistent low-k modes. A reduced photon-baryon acoustic response driven by these modes remains close to a persistent CDM benchmark across multiple random seeds and oscillator-parameter robustness tests. This result is presented as a mechanism-level reduced acoustic viability test, not as a full ΛCDM likelihood replacement. At galactic scales, the previously published Enchan quadrature response produces a low-acceleration gravitational enhancement. At Solar-System scales, the published high-acceleration safeguard suppresses anomalous acceleration and restores the Newtonian/GR limit. The same frozen parameters reproduce the previously published wide-binary transition prediction without regime-specific refitting. The package also includes a preliminary 3D investigation of cosmic-web morphology. Matter-free Enchan PDE evolution produces a web-like hierarchy of voids, sheets, filaments, and knots, and is compared against a finite-tension-off transport control and power-spectrum-matched phase-randomized controls. The archive includes the final manuscript, LaTeX source, Python solvers, frozen-model documentation, parameter provenance, numerical CSV/JSON outputs, automated tests, and publication figures, allowing the reported calculations to be independently reproduced and inspected. Minor correction (2026-08-18): The μ=1 transport-control peak ratios in the CMB Persistence Test were corrected from outdated manuscript values to 1.0653, 1.0337, and 0.7590, matching the archived reproduction code. No underlying simulation results or conclusions were changed. *Update (Sep 16, 2026 / v1.1):* Aligned with the strict non-bundling policy (Policy 310) by updating the obsolete reproducibility instructions in README_UPSTREAM_REQUIREMENTS.md to confirm the 100% clean-room Enchan implementations and explicitly document that no third-party solvers, simulations, or images are bundled. Added requirements.txt to the package, cleaned up markdown backslashes in the documentation, and formalized the citation/provenance boundary of Figure 5 (enchan_true_pde_final_slice.png) as an archived self-organized visualization.