CDN-372: The Tidal Resonance Window

CDN-372 tests whether the periodic coherence effect identified in CDN-371 is cadence-sensitive under fixed tensor amplitude. Using the same dimensionless two-body contrast framework, this artifact holds the 3D trace-free tensor RMS fixed at C0=0.65 while sweeping the periodic tidal phase period across fifteen values from 0.04 to 5.00 t_dyn, under coherent, random-phase, and phase-diffused protocols. The result shows a broad fast-cadence capture plateau followed by slow-cadence collapse: capture fractions span 0.119 to 1.000, with 50 percent threshold periods between 1.382 and 1.649 t_dyn. The release includes simulation code, parameter tables, resonance sweeps, figures, trajectory samples, validation notes, PDF art edition, and packaged archive.