Fix collision track feature for photon transport#3946

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pshriwise wants to merge 17 commits into

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pshriwise:fix-collision-track-photons

Commits on May 27, 2026

Set event nuclide to an empty value if particle type is electron
pshriwise
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Adding a test for using the collision track feature with photons
pshriwise
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Commits on May 28, 2026

Harden event nuclide check. Make testing more explicit
pshriwise
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Adding note on use of nuclide list and consequences for electron/positron interactions
pshriwise
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Altering wording to omit use of 'filter' to reduce mixed terms
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Use pdg code instead of zaid for collision track data
pshriwise
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Correct name of collision test harness method to override parent method correclty.
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Removing erroneous result files used by PyAPITestHarness. Adjusting threading test to check only the size of the resulting collision file.
pshriwise
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Change threading test to a unit test
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Print test parameters in unit test
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Removing unused modules from regression test file
pshriwise
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Adjust methods of the CollitionTrackTestHarness to remove results_true.dat files
pshriwise
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Add reference collision track files
pshriwise
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