Part X: Spectral Origin of the Cosmological Constant

We derive the cosmological constant Lambda ≈ 1.6×10⁻¹²² as a residual spectral invariant of quantized geometry. This value arises from the asymptotic flow of deformation modes Cₙ(τ) → π, yielding Lambda = (a² π²)/12 without renormalization or free parameters. The result completes the spectral derivation of all constants: hbar, c, G, alpha, and Lambda, confirming the geometric origin of vacuum energy.