Moved all extension methods into extension blocks (#1155)

app/MindWork AI Studio/Tools/JsonSerializerOptionsExtensions.cs

@@ -4,18 +4,21 @@ namespace AIStudio.Tools;
 
 public static class JsonSerializerOptionsExtensions
 {
-    /// <summary>
-    /// Makes the options read-only and returns them, so that a static field gets its options in one expression.
-    /// </summary>
-    /// <remarks>
-    /// Options with contracts of their own, i.e., with a TypeInfoResolver, should never change after they were
-    /// declared: whoever used them before such a change would have read or written with other contracts.
-    /// </remarks>
     /// <param name="options">The options, with their TypeInfoResolver set.</param>
-    /// <returns>The same options, now read-only.</returns>
-    public static JsonSerializerOptions AsReadOnly(this JsonSerializerOptions options)
+    extension(JsonSerializerOptions options)
     {
-        options.MakeReadOnly();
-        return options;
+        /// <summary>
+        /// Makes the options read-only and returns them, so that a static field gets its options in one expression.
+        /// </summary>
+        /// <remarks>
+        /// Options with contracts of their own, i.e., with a TypeInfoResolver, should never change after they were
+        /// declared: whoever used them before such a change would have read or written with other contracts.
+        /// </remarks>
+        /// <returns>The same options, now read-only.</returns>
+        public JsonSerializerOptions AsReadOnly()
+        {
+            options.MakeReadOnly();
+            return options;
+        }
     }
 }