This paper introduces the CRTI Stability Model, a dimensionless structural ratio defined as T = R / Φ for diagnosing systemic overcompression in complex adaptive systems. R denotes structural rigidity (formalization, centralization, regulatory density), while Φ represents feedback permeability (capacity for dissent, variation, and adaptive response). The ratio identifies four stability regimes: diffusion (T 1.8). The CRTI provides a minimal cross-domain early-warning framework for detecting structural imbalance before collapse becomes visible. By compressing insights from cybernetics, resilience theory, and exploration–exploitation dynamics into a single operational axis, the model offers a parsimonious stability diagnostic applicable to governance systems, organizations, economies, and technological infrastructures. The framework is conceptual and analytical; empirical operationalization of R and Φ remains subject to domain-specific calibration. CRTI structural rigidity feedback permeability complex adaptive systems systemic overcompression singularization adaptive capacity resilience theory cybernetics exploration–exploitation tradeoff governance stability organizational resilience structural balance early warning systems system collapse modeling