Stability Criteria and Resonance Structure in the Space–Matter–Motion (RMB) Framework

This technical note defines minimal, operational stability criteria for the Space–Matter–Motion (RMB) framework. Long-term coherence is characterized using amplitude-dependent detuning and invariant diffusion (“smear”), leading to bounded stability domains separated by resonance-driven decoherence regions. The work establishes a falsifiable stability language applicable to nonlinear dynamical systems and is intended as a methodological contribution rather than a phenomenological fit or data analysis.