III.T54 — Confinement Bridge Identity

E₆(iι_τ)·κ(C;3)² = −1/(1−ι_τ)² within ±10 ppm. Reduces algebraically to the E₆ near-identity E₆·ι⁶ ≈ −1 since κ(C;3)² = ι⁶/(1−ι)². Closes OQ.07 (C-sector/SU(3) bridge). S-duality transport gives residual = 504·q' where q' = e^{−2π/ι_τ} ≈ 10⁻⁸.