feat: complete Phase 4 McClient integration for A* pathfinding

- Fix MoveHelper.IsOpenGate: MangroveWood -> MangroveFenceGate
- Fix ResetStateForTransfer to cancel and clear pathSegmentManager
- Fix GetCurrentMovementGoal to return correct goal during A* navigation
- Fix SetMovementSpeed(Sneak) speed value consistency (2 -> 1)
- Migrate /pathfind command to use MoveToAStar + PathSegmentManager
- Add NavigateToGoal(IGoal) to McClient for flexible goal navigation
- Refactor MoveToAStar to delegate to NavigateToGoal
- Add ChatBot API: NavigateTo, CancelMovement, GetCurrentMovementGoal
- Expose PathSegmentManager.Goal property for external goal inspection

Made-with: Cursor

MinecraftClient/Scripting/ChatBot.cs

@@ -1246,6 +1246,18 @@ namespace MinecraftClient.Scripting
             return Handler.MoveTo(location, allowUnsafe, allowDirectTeleport, maxOffset, minOffset, timeout);
         }
 
+        /// <summary>
+        /// Navigate to a goal using A* pathfinding with template-based execution.
+        /// Supports GoalBlock, GoalXZ, GoalNear, GoalComposite for flexible targeting.
+        /// </summary>
+        /// <param name="goal">Target goal (GoalBlock, GoalNear, GoalXZ, etc.)</param>
+        /// <param name="timeoutMs">Maximum pathfinding computation time in milliseconds</param>
+        /// <returns>Tuple of (success, descriptive message)</returns>
+        protected (bool success, string message) NavigateTo(Pathing.Goals.IGoal goal, long timeoutMs = 5000)
+        {
+            return Handler.NavigateToGoal(goal, timeoutMs);
+        }
+
         /// <summary>
         /// Check if the client is currently processing a Movement.
         /// </summary>
@@ -1255,6 +1267,24 @@ namespace MinecraftClient.Scripting
             return Handler.ClientIsMoving();
         }
 
+        /// <summary>
+        /// Cancel the current movement, stopping both legacy and A* pathfinding.
+        /// </summary>
+        /// <returns>true if there was an active movement that was cancelled</returns>
+        protected bool CancelMovement()
+        {
+            return Handler.CancelMovement();
+        }
+
+        /// <summary>
+        /// Get the current movement goal location.
+        /// Returns Location.Zero if no movement is active.
+        /// </summary>
+        protected Location GetCurrentMovementGoal()
+        {
+            return Handler.GetCurrentMovementGoal();
+        }
+
         /// <summary>
         /// Look at the specified location
         /// </summary>