Charged-fermion mass predictions from the E₈ generation structure (working notes)

Using the three-generation fermion structure derived in the companion paper and two ab initio constraints — the E₇ instanton Yukawa coupling γ₁ = 0.670 and the Georgi–Jarlskog colour factor N_c = 3 — we predict three charged-lepton masses (m_e, m_μ, m_τ) from six quark-mass inputs with zero free parameters in the lepton sector. The predictions reproduce the correct generational ordering and are consistent with PDG 2024 values within the model uncertainty (χ²/DOF = 0.05). Verification scripts are available at https://github.com/lukasbednarik/E8-GFT.