Einstein–Karahan / MEON Framework v126: Effective Field-Theory Extension of Mass-Dependent Macroscopic Spacetime Torsion

This work presents a theoretical extension of the Einstein–Karahan Framework v125 into an effective field-theory formulation of mass-dependent macroscopic spacetime torsion. The framework connects the earlier torsional activation scaling law, r_s ∝ M_bar^0.3, with the later MEON R2 V50–R50 Master Audit, which tested the MEON_CoreDamper_2P implementation on SPARC galaxy rotation-curve data against standard halo and modified-gravity benchmarks. The central hypothesis is that part of the galactic rotation-curve phenomenology commonly attributed to dark matter may be representable as an effective geometric contribution arising from macroscopic torsion of spacetime. In this formulation, the torsional correction is sourced by baryonic structure, regulated by a core-damper transition mechanism, and constrained by fixed geometric constants such as π/16 and 1/128. This document does not claim a final replacement of dark matter. Instead, it defines a falsifiable effective field hypothesis whose weak-field galactic limit can be tested against rotation curves, lensing systems, spiral photometry, galaxy clusters, and cosmological constraints. The purpose of this version is to provide the theoretical bridge between the original Einstein–Karahan torsion framework and the empirical MEON V50–R50 audit layer. It emphasizes explicit parameter accounting, reproducibility, comparison against competing models, and future falsification tests. The Einstein–Karahan / MEON Framework v126 should therefore be understood as a structured theoretical continuation of the previous framework: a geometric candidate model for galactic dynamics based on macroscopic spacetime torsion, open to independent reproduction, validation, and falsification.