Irreducible Standing and the Condition of Non-Bypassability

This paper determines the stricter condition under which Standing becomes irreducible, and the further condition under which Non-bypassability becomes constitutive rather than merely descriptive. Standing may already be lawfully claimable where retention is no longer optional without structural loss. But that threshold does not yet determine whether the claimed Standing can survive decisive substitution, discharge, or bypass. The present task is to determine what must now be shown before Standing ceases to remain merely lawfully claimable and becomes Irreducible Standing in the strict sense. The gain is correspondingly narrower and harder: not explanatory enlargement, but a stricter threshold within Standing itself, under which decisive substitution fails, bypass unavailability becomes constitutive, and the claim to Standing becomes answerable under the burden of localization. Third of three linked papers following Papers I--IV (Admissibility pressure sequence) in the TII Framework Papers I: Admissibility as a Formal Candidate in the TII Framework. 10.5281/zenodo.19481281 Papers II: Admissibility under Geometric Pressure. 10.5281/zenodo.19481375 Papers III: Admissibility under Physical and Mortal Pressure. 10.5281/zenodo.19481607 Papers IV: Admissibility after Audit. 10.5281/zenodo.19482588