SAGE: Scalable Agentic Grounded Evaluation for Crop Disease Diagnosis. - Muhammad Arbab Arshad; Tirtho Roy; Yanben Shen; Dinakaran Elango; Shivani Chiranjeevi; Asheesh Kumar Singh; Baskar Ganapathysubramanian; Chinmay Hegde; Arti Singh; Soumik Sarkar (CoRR, 2026)