Bugfix for FluxWeight and MeVPrtl#621

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VCLanNguyen wants to merge 1 commit intodevelopfrom

bugfix/fluxweight_for_mevprtl

Commits on Jan 9, 2026

bugfix MeVPrtl to classify boone ntuple flux type as simple flux, and fix flux weight calculator to pick neutrino energy from MCTruth if MCFlux energy is -1
VCLanNguyen
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