Ω_Λ = 8/(3(π + ln2)): A Derivation of Dark Energy from Holographic Bounds, Berry Phase, and Landauer Erasure

This paper presents the Kenos framework, a derivation of the cosmological dark energy density parameter from first principles. Three independent physical inputs are combined: the Bekenstein-Hawking holographic bound on the de Sitter horizon (I_max = pi/H0^2), the Berry phase of an S-duality invariant boundary state (gamma = pi), and the Landauer erasure cost at the Gibbons-Hawking temperature (ln2 per bit). Their sum defines the Ferguson constant f = pi + ln2, yielding: Omega_Lambda = 8 / (3f) = 0.6954 The Hubble constant cancels exactly. No free parameters. No cosmological observations used as input. Tension with Planck 2018 (0.6847 +/- 0.0073): 1.47 sigma. An extension incorporating the four Standard Model forces via e-fold weighted running coupling constants and physical cutoffs (Kenos-4F) yields Omega_Lambda = 0.68468, 0.003 sigma from observation. The S-duality symmetry I -> 1/I resolves the cosmological constant problem. Dark energy is the symmetry-breaking residual from the Big Bang instanton transition, not vacuum energy. One open theoretical problem remains. Primary falsifiable prediction: Euclid space telescope (~2027) will measure Omega_Lambda to +/-0.001 precision, distinguishing the two predictions at approximately 10 Euclid-sigma