One-off script (like export_validation_plots.py / export_event_observables.py)
that writes a 3x3 marginals grid, post_dir/travel_dir norm histograms, and
vector-PDF copies of the KL-bars/photon-edep/event-level plots directly into
the thesis-presentations repo's images/ folder.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
lars