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Abstract: This deposit presents the Geometric Relay Theory (GRT), an extension of Minazzoli’s Entangled Relativity. File 1 (GRT_English_Larquey2026.pdf): Provides the full theoretical framework. It derives the "Geometric Relay" (\sigma) from the L_m^2/R action and establishes the functional isomorphism between cyclic cosmology and self-organizing systems. File 2 (M87_Faraday_Larquey2026_FINAL.pdf): Provides a direct observational test. By applying the modified Maxwell equations (Q = 2L_m/R) to the M87* black hole environment, we predict a structural Faraday rotation \delta\chi \approx 29^\circ. This zero-parameter prediction offers a physical explanation for the polarization anomalies reported by the Event Horizon Telescope (EHT) between 2017 and 2021. First semi-analytical observational test against published EHT polarimetric data for M87* (2017-2021) and Sgr A*. The test uses two independent MAD profiles (power-law and Moscibrodzka-type). Both converge: <dQ/Q>_w = 56-67%, delta-chi = 2-65 deg at 230 GHz, zero free parameters.In GR, the extra Faraday rotation from this mechanism is identically zero. The factor-3 drop in polarization fraction and the EVPA flip are consistency tests (not zero-parameter predictions) compatible with reasonable MAD conditions. A falsifiable prediction is derived for Sgr A*: the temporal EVPA variance should correlate with betavariance, with amplitude 5-27 deg on minute timescales discriminable from GR by correlation magnitude. A GRMHD simulation with Q(x) is needed for definitive confirmation. Source code is included.