DB-Grade: frozen severity parameters, feature tables and reference inference code for dry bubble grading in Agaricus bisporus

Companion artifacts for Wang et al., "DB-Grade: a cross-country, annotation-free severity grading pipeline for real-time variable-rate fungicide decision support in dry bubble disease of Agaricus bisporus," submitted to Computers and Electronics in Agriculture. This archive contains frozen severity parameters, per-crop severity tables for both image collections (n=1,446 Türkiye + n=1,022 Penn State crops), blinded three-rater expert scores on 100 stratified samples, and a reference Python inference script. See included README.md for file-level documentation.