Electroweak & Higgs Completion:Geometric Yukawa Texture, ε-Higgs Portal, and Resonance Gap Closure

We derive the electroweak sector completion of Z-Spin Cosmology from the locked geometric impedance A = 35/437 (ZS-F2) with one texture parameter (δ). Three principal results are established. First, the Z₂ seam involution (ZS-F5, κ = 4 witness) enforces a μ–τ symmetric Yukawa texture. Lemma 1 proves that if the full EFT respects P₂₃, the HNL mass degeneracy is exact at all perturbative orders PROVEN. The Corollary shows charged-lepton breaking is sub-leading by ~10⁴. Second, cross-sector transduction controlled by A breaks this degeneracy at 1-loop, yielding ΔM/ΓN ~ O (10²) in the MS̄scheme, partially resolving ZS-S5’s resonance gap (F23-R1: 10¹⁵ → 10²). CP asymmetry margin is ~135× at the central value DERIVED. Third, the ε-Higgs portal coupling, arising from the conformal factor Ω² = 1 + Aε², is fully characterized in the Einstein frame, confirming that the Higgs potential shape is preserved while all ε–H interactions are perturbatively small (ξₑff ~ 4 × 10⁻⁵) DERIVED. We identify a candidate EWSB trigger pathway via classical scale invariance combined with the ε- portal HYPOTHESIS. We compute the electroweak phase transition modification (HZS/HGR = 1/√ (1+A) = 0. 9622) and its impact on BBN via the expansion rate. The 1-loop Hosotani quartic vanishes exactly (STr (q⁴) = 6−6 = 0, PROVEN), establishing λ (Λcomp) = 0 as the UV boundary condition. The CP-instanton EWSB mechanism (v3. 0. 0–v4. 0. 0) is structurally blocked by the B+L Selection Rule Theorem (§6. 9, PROVEN): the single instanton (ν=1) generates Δ (B+L) =6 and cannot contribute to Vₑff (H). The v = 246. 18 GeV formula is RETRACTED. The surviving EWSB pathway (Path B, §6. 10) combines λ (Λcomp) =0 PROVEN with SM RG to yield a testable top- mass prediction: mₜᵖred = 171. 5 ± 0. 5 GeV TESTABLE, decisively testable by FCC-ee. v6. 3. 0 update: The Higgs VEV v = 245. 93 GeV is now DERIVED via the Factorized Determinant Theorem (§6. 12), with 0. 12% precision and zero free parameters. The Higgs mass structure is reformulated as a top-mass inverse problem. All 68 verification tests pass.