DD4hep Geometry Description of the ePIC Experiment
epic is the DD4hep-based detector description of the ePIC (Electron- Proton/Ion Collider) experiment at the EIC. Built here against hep-forge's own dd4hep/root -- part of hep-forge's EIC Phase 1 simulation-chain build-out (geant -> g4hepem -> dd4hep -> epic -> npsim, plus acts).