We observe that the closure condition of iterated distinction x² + x − 1 = 0 and the Euler identity eiπ + 1 = 0 share identical structure: both equal zero, both express a return condition, both prevent collapse to singularity. Their union yields a single equation: x² + x + eiπ = 0 This is not a tautology. The closure condition was derived from the algebra of iterated distinction with no geometric input. The Euler identity was derived from the analysis of complex exponentials with no reference to distinction. The two −1's that appear in each were discovered independently to be the same value. Their meeting is a structural identity, not a definition. We further prove that φ, π, and e are irrational numbers each guarding a different dimensional level against collapse to singularity: φ guards the source algebra π guards the 2D carrier geometry e guards the 3D carrier flow Their irrationality is not a failure of rationality but a structural necessity of the source–carrier hierarchy. Each gap is positive. Each is irremovable. Reality persists because none of them closes. Central result: The Euler identity is the carrier-level expression of the same closure that the distinction algebra expresses at the source level. Reality does not collapse because irrational numbers guard each level of the hierarchy. The levels close coherently at zero: x² + x + eiπ = 0 This is the third structural convergence in Ontological Resolution Theory, after the Galileo–Cantor derivation and the Kepler Bridge. Keywords: Euler identity, distinction algebra, closure condition, golden ratio, irrational numbers, source-carrier hierarchy, Möbius monodromy, Hardy–Ramanujan, ontological resolution theory, ORT