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/Ping/PingResponse.cs

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+namespace io.github.hatayama.uLoopMCP
+{
+    /// <summary>
+    /// Response schema for Ping command
+    /// Provides type-safe response structure
+    /// </summary>
+    public class PingResponse : BaseToolResponse
+    {
+        /// <summary>
+        /// The response message from Unity
+        /// </summary>
+        public string Message { get; set; }
+
+        /// <summary>
+        /// Create a new PingResponse
+        /// </summary>
+        /// <param name="message">Response message</param>
+        public PingResponse(string message)
+        {
+            Message = message;
+        }
+
+        /// <summary>
+        /// Parameterless constructor for JSON deserialization
+        /// </summary>
+        public PingResponse()
+        {
+            Message = string.Empty;
+        }
+    }
+} 

Client/Packages/io.github.hatayama.uloopmcp/Editor/Api/McpTools/Ping/PingResponse.cs.meta

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Client/Packages/io.github.hatayama.uloopmcp/Editor/Api/McpTools/Ping/PingSchema.cs

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+using System.ComponentModel;
+
+namespace io.github.hatayama.uLoopMCP
+{
+    /// <summary>
+    /// Schema for Ping command parameters
+    /// Provides type-safe parameter access with default values
+    /// </summary>
+    public class PingSchema : BaseToolSchema
+    {
+        /// <summary>
+        /// Message to send to Unity
+        /// </summary>
+        [Description("Message to send to Unity")]
+        public string Message { get; set; } = "Hello from TypeScript MCP Server";
+    }
+} 

Client/Packages/io.github.hatayama.uloopmcp/Editor/Api/McpTools/Ping/PingSchema.cs.meta

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Client/Packages/io.github.hatayama.uloopmcp/Editor/Api/McpTools/Ping/PingTool.cs

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+using System.Threading;
+using System.Threading.Tasks;
+
+namespace io.github.hatayama.uLoopMCP
+{
+    /// <summary>
+    /// Ping tool handler - Type-safe implementation using Schema and Response
+    /// Connection test and message echo functionality
+    /// </summary>
+    [McpTool(
+        DisplayDevelopmentOnly = true,
+        Description = "Connection test and message echo"
+    )]
+    public class PingTool : AbstractUnityTool<PingSchema, PingResponse>
+    {
+        public override string ToolName => "ping";
+
+        protected override Task<PingResponse> ExecuteAsync(PingSchema parameters, CancellationToken cancellationToken)
+        {
+            // Type-safe parameter access - no more string parsing!
+            string message = parameters.Message;
+            string response = $"Unity MCP Bridge received: {message}";
+
+            // Create type-safe response
+            PingResponse pingResponse = new PingResponse(response);
+            return Task.FromResult(pingResponse);
+        }
+    }
+}

Client/Packages/io.github.hatayama.uloopmcp/Editor/Api/McpTools/Ping/PingTool.cs.meta

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