IV.T152 — Cabibbo Angle: sin(θ_C) = ι_τ·(1−ι_τ) at −2327 ppm

sin(θ_C) = ι_τ·(1−ι_τ) at −2327 ppm from PDG. Wave 11A holonomy derivation: the T² has two fundamental cycles γ₁, γ₂ with holonomies ι_τ and (1−ι_τ). The transition amplitude ⟨e^{iγ₁}, e^{iγ₂}⟩ on T² with the τ-metric equals ι_τ·(1−ι_τ), proving λ_C from the T² inner product structure. Zero free parameters. Scope τ-effective confirmed (unique best fit at 50-digit scan).