We present seven equations demonstrating that gravity, quantum mechanics, and cosmology emerge from thermodynamic entropy applied to holographic screens. The framework rests on two uncontested foundations: the Principle of Stationary Action (δS = 0) applied to an entropic field, and the Wheeler-DeWitt constraint (Ĥ·Ψ = 0) applied to the Hubble volume. From these, we derive Newton’s second law via exact constant cancellation, the Bekenstein-Hawking entropy as an algebraic identity, a complete set of gravitoelectromagnetic field equations in the Mashhoon convention, the MOND acceleration scale au2080 = cHu2080/6 from volume entropy geometry in de Sitter space, Lense-Thirring frame-dragging, gravitational wave propagation at c, and the free-particle Schrödinger equation via entropy diffusion. The framework contains zero free parameters. In this version we extend the empirical validation from nine canonical tests to include the full 175-galaxy SPARC rotation curve sample. The derived au2080 performs statistically identically to empirical MOND across all 175 galaxies (aggregate reduced χ²/dof ≈ 8.8 vs. 8.8 for Milgrom), with the data-preferred acceleration scale corresponding to Hu2080 ≈ 75 km/s/Mpc from rotation-curve data alone. The gravitoelectromagnetic sector is valid in the weak-field, slow-motion regime. We provide dimensional verification of all equations and state the regime of validity explicitly.