test: add dune mock geometr to simg4ox test#411
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Map Geant4 steps that enter a sensitive detector volume to SURFACE_DETECT in the CPU SEvt record. The detector surface can otherwise appear as SURFACE_SREFLECT followed by a terminal NAN_ABORT, which does not match the Opticks-side detector history. When this conversion happens, preserve the incoming pre-step momentum and polarization so the recorded detector point keeps the same direction convention as the GPU record. Also skip the redundant NAN_ABORT step after a detection has already been recorded.
Teach U4StepPoint to classify native Geant4 OpWLS as BULK_ABSORB so the existing SEvt rejoin path can rewrite the parent record to BULK_REEMIT when the reemitted photon starts tracking. Label optical secondaries produced by a tracked photon with the next-generation lineage of the parent. This keeps WLS reemission in the same photon record instead of fabricating a new photon id, which previously overflowed the 100-photon nested DUNE event.
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