CDN-369: The Domain-Patterned Contrast Field

CDN-369 extends the two-body contrast model by replacing generic environmental turbulence with explicit larger-domain gravitational node patterns. Using exact differential acceleration from external point nodes and comparing it to the local tidal tensor approximation, this artifact tests whether matched scalar contrast C0 erases domain memory. The result shows that scalar M/D³ strength alone is insufficient: two-body behavior retains memory through tidal tensor class, tensor sign/eigenstructure, and higher-order finite-distance corrections. The release includes simulation code, matched-domain sweeps, distance sweeps, trajectory samples, figures, prediction hashes, and validation notes.