DARK ENERGY FROM ENTROPY-GEOMETRY COUPLING: THERMODYNAMIC DERIVATION WITH QUANTUM BULK ENTANGLEMENT CORRECTION AND INTEGRATION INTO EINSTEIN FIELD EQUATIONS

Dark energy is not a mystery force. It is the thermodynamic cost of quantum information growing at the boundary of the observable universe. Applying the First Law of Thermodynamics to the cosmic horizon, combined with a quantum bulk entanglement correction derived from established results in holographic gravity, we replace Einstein's unexplained cosmological constant Λ with a derived dynamic term Λ = 3HcQ/R_P that produces the exact observed value from first principles. No free parameters. No new fields. Three independent predictions match DESI 2024 at sub-1σ.