IV.P217 — m_u/m_d NLO Candidate at +29 ppm

NLO achieves +29 ppm from FLAG lattice m_u/m_d=0.474±0.018: 1000× improvement over LO. But NLO structure found by scan, not derived from τ³ geometry. Alternative: ι_τ(1+ι_τ)=0.4578 at -3877 ppm (simpler, less precise). Remains conjectural pending NLO derivation.