Coherent Ordering Dynamics and the Universal Predictive Algebra: A Multivariable Sensitivity Framework with Empirical EEG Validation and Control-Field Dynamics --- ABSTRACT / DESCRIPTION We present Coherent Ordering Dynamics (COD), a framework describing how structured outcomes emerge in complex systems through the interaction of activation, sensitivity, constraints, and stochastic realization. Building on a nonlinear master equation, we define an effective observable and its Jacobian sensitivity, demonstrating that maximal responsiveness occurs in an intermediate regime rather than at system extremes. Using meditation EEG data (ds001787), we empirically validate this prediction, identifying a consistent sensitivity peak and showing that the system's optimal regime forms a saddle manifold in multivariable space. Temporal analysis reveals structured low-frequency modes, while control-field dynamics—modeled through breath-like oscillatory proxies—demonstrate that the system's optimal state is not fixed but dynamically tunable. We formalize these findings into the Universal Predictive Algebra (UPA), expressed as an outcome functional integrating four universal components: activation (gate), sensitivity (Jacobian), constraint (inverse friction), and probabilistic realization. This formulation provides a general predictive grammar applicable across physical, biological, and computational systems. Extensive diagnostics, normalization procedures, failure modes, and falsifiability criteria are included to ensure reproducibility and scrutiny robustness. Results indicate that high-sensitivity regimes are rare, structured, and dynamically navigable, supporting a view of prediction as alignment within a constrained state space rather than deterministic computation. This work establishes a unified mathematical and empirical framework for understanding how complex systems organize, respond, and evolve under internal dynamics and external control fields.