chore(unity): 固定Unity CLI Loop本地包并移除UnitySkills依赖

Client/Packages/io.github.hatayama.uloopmcp/Editor/Api/McpTools/GetHierarchy/GetHierarchyTool.cs

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+using System.Threading.Tasks;
+using System.Threading;
+
+namespace io.github.hatayama.uLoopMCP
+{
+    /// <summary>
+    /// Tool to retrieve Unity Hierarchy information in AI-friendly format
+    /// 
+    /// 
+    /// This Tool class delegates to GetHierarchyUseCase for business logic execution,
+    /// following the UseCase + Tool pattern for separation of concerns.
+    /// 
+    /// Related classes:
+    /// - GetHierarchyUseCase: Business logic and orchestration
+    /// - HierarchyService: Core logic for hierarchy traversal
+    /// - HierarchySerializer: JSON formatting logic
+    /// - HierarchyNode: Data structure for hierarchy nodes
+    /// - HierarchyNodeNested: Nested hierarchy structure
+    /// - HierarchyResultExporter: File export functionality
+    /// - GetHierarchySchema: Type-safe parameter schema
+    /// - GetHierarchyResponse: Type-safe response structure
+    /// </summary>
+    [McpTool(Description = "Get Unity Hierarchy structure for the whole scene, a root path, or selected GameObject descendants using UseSelection. Use this when the child tree, parent-child structure, or descendants under the selection are needed. Use find-game-objects for selected object details and component properties.")]
+    public class GetHierarchyTool : AbstractUnityTool<GetHierarchySchema, GetHierarchyResponse>
+    {
+        public override string ToolName => "get-hierarchy";
+        
+        protected override async Task<GetHierarchyResponse> ExecuteAsync(GetHierarchySchema parameters, CancellationToken cancellationToken)
+        {
+            // Create and execute GetHierarchyUseCase instance
+            GetHierarchyUseCase useCase = new(new HierarchyService(), new HierarchySerializer());
+            return await useCase.ExecuteAsync(parameters, cancellationToken);
+        }
+    }
+}