MST Dark Matter v4: Residual-Coherence Field Model and Dual-Signature Evidence Framework

We present MST-DM v4, a compact and falsifiable framework in which dark matter is re-interpreted as a Residual-Coherence Field (RCF): a non-particle gravitational memory layer produced by long-term mass-flow computation. The model unifies two independent observational signatures. The first is a gravitational-memory decay parameter, τ_mem, extracted from correlations between weak-lensing residuals and reconstructed star-formation histories. The second is a narrow ~20 GeV gamma-ray halo recently reported in Fermi-LAT archival data, which we interpret as a stress-band emission threshold arising from the RCF. We provide a minimal toy model for RCF density, a τ_mem–τ_c scaling hypothesis, a spatial cross-correlation prediction, and a set of observational discriminants contrasting RCF with WIMP-based ΛCDM expectations. The resulting dual-signature program offers a replication-ready test using Euclid, DESI, JWST, Fermi, and CTA, and frames dark matter as emergent archival geometry rather than particulate matter.