AI-Driven Vehicle Routing Optimization: A Hybrid Model Using GNN, PPO, Tabu Search, and Agentic IntelligenceOussama Adrouj, Azeddine Khiat, Ali El Barnouni, Mohamed El Hachimi and Mohammed KhailiE3S Web Conf., 680 (2025) 00107DOI: https://doi.org/10.1051/e3sconf/202568000107