A Multi-center, Phase 1/2a, First-in-human (FIH) Study Investigating the Safety, Tolerability, and Efficacy of AMT-260 in Adults With Unilateral Refractory Mesial Temporal Lobe Epilepsy (MTLE) Administered Via Magnetic Resonance Imaging (MRI)-Guided Convection-enhanced Delivery (CED) | Arctuva