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

Client/Packages/io.github.hatayama.uloopmcp/Editor/Compilation/PreloadMetadataSecurityValidator.cs

@@ -0,0 +1,16 @@
+namespace io.github.hatayama.uLoopMCP
+{
+    /// <summary>
+    /// Compatibility wrapper that keeps the old type name while delegating to the structured metadata validator.
+    /// The preload security check must inspect real metadata rows so user literals do not trigger false positives.
+    /// </summary>
+    internal sealed class PreloadMetadataSecurityValidator : IPreloadAssemblySecurityValidator
+    {
+        private readonly SystemReflectionMetadataPreloadValidator _validator = new SystemReflectionMetadataPreloadValidator();
+
+        public SecurityValidationResult Validate(byte[] assemblyBytes)
+        {
+            return _validator.Validate(assemblyBytes);
+        }
+    }
+}