Fermion Masses as Fossil Records of Cosmic Critical Dynamics: Evidence for a Neutrino Critical Point from SO(8) Triality

The CDUFD framework predicts that fermion masses follow the critical scaling mf ∝ δ(nf-14)ν, where nf is determined by SO(8) quantum numbers. Using the SO(8) weight formula we compute theoretical critical orders for all Standard Model fermions. Comparison with experimental masses reveals systematic deviations: Δ nₑ = -0.345, Δ n_μ = -0.685, Δ n_τ = +0.345, i.e. the striking integer ratio Δ nₑ:Δ n_μ:Δ n_τ = -1:-2:+1. This pattern cannot be explained by a single critical point. We propose that it arises from critical lag during the electroweak phase transition: different generations (associated with the three inequivalent SO(8) representations) possess distinct relaxation rates relative to the spacetime relaxation rate. Using a simplified Langevin model we show that the observed Δ nf implies relative relaxation rates ηₑ:η_μ:η_τ ≈ 0.655:0.315:1.345. The model requires a second critical point in the neutrino sector (nc^ν≈13.5), which naturally explains the smallness of neutrino masses via the seesaw mechanism. Using the unified scaling law and NuFIT 6.0 (2024) oscillation data, we predict the flavour‑eigenstate mass ratio mνₑ:mν_μ:mν_τ=1:1.15:1.28, i.e. mνₑ/mν_μ=1.15±0.04, testable at JUNO. This work interprets fermion masses as direct evidence of non‑equilibrium critical evolution in the early universe. V2.0 upgrades the generation assignment from a triality-based postulate to a dynamical derivation: the vector representation couples directly to the spacetime metric, the spinor representations couple through the spin connection, yielding 8v>8R>8L8v>8R>8L as the mass ordering. The integer ratio +1:−2:−1+1:−2:−1 is theoretically predicted, not post-hoc fitted; experiment agrees to within 8%.