Dimension-Driven Structural Transition at N = 5: Emergence of a Stable Regime in sign(dRD) with Scalar Control

This work proposes a structural mechanism for the emergence of classical reality from quantum systems, based on a redundancy threshold and dimensional effects. We demonstrate that system size (N) induces a measurable transition in redundancy sign, independent of additional oscillatory components, suggesting an intrinsic dimensional phase separation between regimes (e.g. N=4 vs N=5). Additionally, a scalar control parameter (λ) is shown to induce a real sign flip in redundancy, indicating the presence of a controllable boundary condition governing classical emergence. The results suggest that classical reality is not a continuous limit, but a phase transition driven by information redundancy and system dimensionality. This framework opens a new perspective on quantum-to-classical transition, with implications for decoherence theory, quantum information, and foundational physics.