Exclusion of Two-Sided Singular Transport for the Open Chiral SCT Connection Matrix

Research Note 14 in the "Geometry of the Critical Line" programme. RN13 proved M₁₁(λ,m) ≠ 0 on the real axis for the SCT connection matrix. This note proves the stronger result M₁₁ ≠ ±1, which by the involution identity M₁₂·M₂₁ = 1 − M₁₁² and Paper 40's M₂₁ ≠ 0 implies M₁₂ ≠ 0. The proof shows that no solution of the chiral ODE can be r₂-class (singular Frobenius branch) at both endpoints simultaneously, via a two-sided truncated flux-balance argument. Combined with RN13 and Paper 40, this establishes complete entrywise real-axis nonvanishing of M(λ,m) for all |m| ≥ 1 in the SCT family. No arithmetic interpretation is claimed. Part of a 46-paper open-access programme. The programme does not claim to prove the Riemann Hypothesis.