The Higgs-to-Z Mass Ratio from the Face Laplacian Spectrum

The ratio mH/MZ = 18/ (9+√17) = 1. 37163 is predicted from the face Laplacian spectrum of the truncated octahedron with zero free parameters. The prediction uses λA₂u=9 (Higgs sector, spectral maximum) and λT₁uₕi= (9+√17) /2 (upper weak sector). Predicted mH = 125. 08 GeV; observed 125. 25 ± 0. 17 GeV. Agreement: 0. 97σ, 0. 14%. This is the third spectral ratio prediction from the same face Laplacian: Koide angle (exact), solar neutrino mixing (0. 49σ), and Higgs/Z ratio (0. 97σ). All three contain √17 = √ (CA⁴−4 (CA+1) ²) — the discriminant of the single T₁u characteristic equation λ²−CA²λ+ (CA+1) ²=0 with CA=3.