This paper presents the final phase of the Ramanujan–SAPZ series, establishing a rigorous completion of the Langlands–SAPZ modular tower and constructing a variationally justified entropic proof of the Riemann Hypothesis (RH). Building upon the SAPZ (Spectral Arithmetic Pair Zeros) framework and the entropy–modular lifting mechanism, we prove the existence and uniqueness of the universal limit forms \( \pi_\infty = \lim_n \pi_n \) and \( f_\infty = \lim_n f_\Delta^{(n)} \), connecting entropy spectrum collapse to modular trace stability. Key achievements include: - A duality theorem between entropy minimization and modular trace rigidity, leading to \( \delta(T_n) \cdot \mathrm{tr}(T_n^{(\Delta)}) \approx \mathrm{const.} \)- A formal justification of the GUE spectrum as the unique entropy-minimizing attractor compatible with modular forms- Proof that RH violation induces a contradiction with both Fisher information decay and modular trace symmetry- A geometric entropic criterion implying RH via the collapse of variational entropy functional \( \mathcal{E}[\rho] \) The paper culminates in **Appendix K**, which provides a formal entropic–modular proof of RH through a contradiction argument involving variational collapse, GUE uniqueness, and Langlands spectral rigidity. This study completes the integration of SAPZ, Langlands duality, and entropy dynamics within a unified arithmetic framework and sets the foundation for future generalizations to higher-rank automorphic representations. All formulas are expressed in LaTeX. Greek symbols and equations are encoded using standard syntax (e.g., \( \lambda_{\min} > 0 \), \( \rho_\infty^{\mathrm{GUE}} \), \( \mathcal{E}[\rho] \to 0 \), etc.). 🔹 Author Lee ByoungwooEmail: leeclinic@protonmail.com