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

Client/Packages/io.github.hatayama.uloopmcp/Editor/Shared/Security/DynamicCodeSecurityLevel.cs

@@ -0,0 +1,21 @@
+namespace io.github.hatayama.uLoopMCP
+{
+    /// <summary>
+    /// Security level definitions for ExecuteDynamicCodeTool
+    /// Related classes: DynamicCodeSecurityManager, AssemblyReferencePolicy, RoslynCompiler
+    /// </summary>
+    public enum DynamicCodeSecurityLevel
+    {
+        /// <summary>
+        /// Dangerous APIs (System.IO, System.Net.Http, Process, reflection, etc.) are blocked.
+        /// Default level for safe Unity development.
+        /// </summary>
+        Restricted = 1,
+
+        /// <summary>
+        /// All APIs available without restrictions.
+        /// Warning: Security risks present - use only with trusted code.
+        /// </summary>
+        FullAccess = 2
+    }
+}