This archive contains the full computational study, analysis outputs, and manuscript for a reproducible investigation of event-conditioned dynamics in a phase–frequency modulated (Phase–FM) oscillator. The work introduces a geometric observable derived from the analytic signal and defines an event-conditioned enrichment statistic that quantifies deviations from randomized baselines. Using GPU-accelerated Monte Carlo experiments with extensive phase randomization and paired-contrast controls, the study demonstrates three key empirical findings: A sharp regime transition in the enrichment statistic as a function of system parameters, tightly bracketed in parameter space. Robust persistence of the observed structure under phase randomization, ruling out single-trajectory artifacts. Systematic, statistically significant modulation of the effect by coupling ratio, with the constant e consistently outperforming a nearby control ratio across most tested regimes, while other constants exhibit strongly regime-dependent behavior. The repository includes: The full LaTeX manuscript All generated figures Raw CSV outputs (*_per_rep.csv, *_summary.csv, *_contrasts.csv) Scripts used for analysis and visualization Reproducible command-line configurations This work does not propose a physical theory. Instead, it documents a rigorously controlled computational phenomenon and provides a transparent methodological framework for further mathematical and dynamical investigation.