ESSRT (Expanding Solar System Resonance Theory) physics core — pure, injectable-constants, no I/O, no globals, no DOM. The complete model incl. fitted coefficients; every published version immutably ships one recorded model identity.

ESSRT rendered model values — the published display keys (day/year lengths, precession rates, orbital elements, eclipse-audit results, deep-time anchors, …), generated by the 3d model-values registry from the engine and its provenance-gated campaign artif