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/Pathing/Execution/PathSegmentManager.cs

@@ -23,6 +23,7 @@ namespace MinecraftClient.Pathing.Execution
 
         public bool IsNavigating => _executor is not null && !_executor.IsComplete;
         public int ReplanCount => _replanCount;
+        public IGoal? Goal => _goal;
 
         public PathSegmentManager(Action<string>? debugLog = null, Action<string>? infoLog = null)
         {

MinecraftClient/Pathing/Moves/MoveHelper.cs

@@ -105,7 +105,7 @@ namespace MinecraftClient.Pathing.Moves
         {
             return mat is Material.AcaciaFenceGate or Material.BirchFenceGate
                 or Material.CrimsonFenceGate or Material.DarkOakFenceGate
-                or Material.JungleFenceGate or Material.MangroveWood
+                or Material.JungleFenceGate or Material.MangroveFenceGate
                 or Material.OakFenceGate or Material.SpruceFenceGate
                 or Material.WarpedFenceGate or Material.CherryFenceGate
                 or Material.BambooFenceGate or Material.PaleOakFenceGate;