V97: Beat-Quantum Principle in YAGC — Quantum as Beat, Update, and Committed Record

Current quantum engineering treats "quantum" as a fragile state requiring extreme isolation for preservation. The YAGC (Yoshida-AI-Generated Cosmology) framework proposes a fundamentally different definition: a quantum is a discrete beat-event (an update) that becomes a committed record under finite-information constraints. This paper establishes the Beat-Quantum Principle through four YAGC foundations: the Σ-principle (V60: finite precision, bounded propagation, temporal memory), the OU engine (V84/V87: statistical convergence via mean/variance decomposition), the sufficiency threshold (V18: r_b > 0.85 for commitment), and inertial coherence (V27: coherence as default state). We present V97-SM1, a minimal simulation demonstrating computability under fluctuation, where reliable outcomes emerge through ensemble convergence rather than perfect control. A key contribution is the Unified Beat Principle: the same mathematical structure describing particle physics in V41–V55 (field excitation as χ-beats) directly extends to macroscopic event observation. This dissolves the quantum-classical boundary, positioning beat-based computation as scale-invariant—from Planck-scale physics to environmental sensing. Under this framework, qubit performance is redefined from "coherence time" to "event-capture capability" (resolution × capture rate × frequency). The YAGC quantum calculator becomes an interface between physical reality and AI reasoning, enabling environment-coupled computation where fluctuations serve as input data rather than noise to eliminate. The simulation (V97-SM1) confirms: (1) statistical convergence following 1/√N scaling, (2) existence of computable regions where r_b > 0.85, and (3) systematic distribution shifts under control inputs. This validates the thesis: a fluctuating universe can compute—indeed, it may compute only by fluctuating.