The Wolfenstein A Parameter from Face-Spectral Complement: A = (F−r₁)/F

We derive the Wolfenstein A parameter as the face-spectral complement of the lower T₁u eigenvalue: A = (F−r₁)/F = (19+√17)/28 = 0.82583, where F = 14 is the face count and r₁ = (9−√17)/2 is the left-handed T₁u eigenvalue. This resolves the previous −1.1σ tension to −0.015σ. The formula has a direct physical interpretation: the fraction r₁/F is the spectral weight of the first-generation (left-handed) eigenvalue on the face graph, and A is the remaining fraction available for second-generation mixing. Combined with Papers #51 and #64, all four Wolfenstein parameters (λ, A, ρ̄, η̄) are now derived from cell integers at better than 0.4σ individual tension.Part of the Unified Foam Field Theory series. Priority date: 20 February 2026. This paper closes the NLO Wolfenstein programme: combined with Paper #51 (NLO λ), Paper #64 (NLO ρ̄), and Paper #67 (NLO η̄/δ_CKM), all four Wolfenstein parameters are now derived from cell integers at better than 0.4σ individual tension. Independently verifiable; see companion repository at https://github.com/WebEnvy/UnifiedFoamFieldTheory.