A STRUCTURAL DEFECT FRAMEWORK FOR FUNDAMENTAL CONSTANTS Toward a Minimal Geometric Interpretation of Physical Observables --- ABSTRACT We propose an exploratory mathematical framework in which a small set of fundamental constants, { e, π, G_Catalan, ζ(3) } define a near-saturated additive structure: S = e + π + G + ζ(3) ≈ 8 Δ = 8 − S We investigate the hypothesis that physical observables emerge as structured responses to the residual defect Δ. A complementary multiplicative structure, S_mult...