Add project files.

Assets/Scripts/Movement/Mover.cs

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+using UnityEngine;
+using UnityEngine.AI;
+using UnityEngine.InputSystem;
+
+namespace RPG.Movement
+{
+    public class Mover : MonoBehaviour
+    {
+        [SerializeField] private Transform target;
+
+        // Cache components for performance
+        private NavMeshAgent navMeshAgent;
+        private Animator animator;
+
+        private void Awake()
+        {
+            // Get component references once
+            navMeshAgent = GetComponent<NavMeshAgent>();
+            animator = GetComponent<Animator>();
+        }
+
+        void Update()
+        {
+            UpdateAnimator();
+        }
+
+        public void MoveTo(Vector3 destination)
+        {
+            navMeshAgent.destination = destination;
+        }
+
+        private void UpdateAnimator()
+        {
+            // This is your original code, which is correct!
+            // It just uses the cached variables now.
+            Vector3 velocity = navMeshAgent.velocity;
+            Vector3 localVelocity = transform.InverseTransformDirection(velocity);
+            float speed = localVelocity.z;
+            animator.SetFloat("forwardSpeed", speed);
+        }
+    }
+}

Assets/Scripts/Movement/Mover.cs.meta

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+fileFormatVersion: 2
+guid: 99048001b4ebc1543911415b71049d4a