The Curvature Feedback Model: A Four-Paper Program for Geometric Cosmology Without the Dark Sector

The Curvature Feedback Model (CFM) replaces dark energy with a geometric curvature return potential and embeds modified gravity within the Horndeski/f(R) framework. This deposit contains four papers presenting a complete theoretical program: Paper I establishes the game-theoretic foundation and validates the CFM against Pantheon+ supernovae (Delta chi2 = -12.2 vs. LCDM). Paper II extends the framework to a baryon-only universe with MOND unification, achieving joint SN+CMB+BAO compatibility (Delta chi2 = -5.5). Paper III provides the Lagrangian underpinning (R + gamma R2) with full hi_class CMB validation, yielding Delta chi2 = -3.7 vs. LCDM on Planck 2018 data (alpha_M0 = 0.0011, 1.76 sigma detection). Paper IV introduces the vector sector for galactic MOND dynamics and tests against the full SPARC database (171 galaxies), deriving the MOND scale a0 = cH0/(2pi) from first principles (13% discrepancy, 0.66 sigma). Analysis code available at https://github.com/lukisch/cfm-cosmology.