Coherence Intelligence: A Unified Taxonomy, Tri-Signal Architecture, and Mathematical Specification for Structural Coherence in Living Systems

"Canon III does not propose a hypothesis about intelligence. It defines the system-level observable that emerges from the measurement geometry and dynamical rules specified in Canon I and Canon II" Technical Canon III introduces Coherence Intelligence (CI) as the apex construct of the Standard Coherence Fidelity Layer (SCFL) measurement architecture. CI is the system-level capacity to maintain, restore, and extend coherence across bio-signals, interior signals, and identity structure under changing conditions. This specification defines the five-layer CI taxonomy (Coherence Intelligence, Capacity, Competence, Activation, and Invariant), the tri-signal architecture (C_bio, C_int, C_dyn), the Stability Operator S and Fusion Operator G, and the Identity Trajectory Canon — seven mathematically distinct trajectory classes with formal regime-transition rules and rupture dynamics. The specification is grounded in Technical Canon I (DOI: 10.5281/zenodo.18824674) and Technical Canon II (DOI: 10.5281/zenodo.18828302), extends those architectures to the apex construct, and maps five exploratory application territories where the physics opens measurement space that existing frameworks have not yet formally reached. The specification is frozen under AE-OS governance. All claims remain contingent on future counterexample. Among the exploratory territories identified, the tri-signal architecture opens a new class of continuous human system measurement that sits adjacent to — but is not captured by — existing wearable sensor standards, biometric monitoring protocols, and recovery science frameworks. The exterior signal layer C_bio formalizes the restorative-dissipative dynamics of embodied load; the interior signal layer C_int introduces a formally specified measurement architecture for interior coherence that has no current analog in continuous sensing; and the integrative layer C_dyn tracks structural trajectory using Lyapunov stability criteria. Together, these three layers enable detection of structural coherence as an emergent property of the whole system — a measurement class the Canon names and formally specifies as open terrain for any field that eventually moves into it.