Update with RuboCop findings

Author: nilcolor

lib/mcp/tool/output_schema.rb

@@ -39,6 +39,7 @@ def deep_transform_keys(schema, &block)
             if key.casecmp?("$ref")
               raise ArgumentError, "Invalid JSON Schema: $ref is not allowed in tool output schemas"
             end
+
             result[yield(key)] = deep_transform_keys(value, &block)
           end
         when Array

test/mcp/tool/output_schema_test.rb

@@ -136,18 +136,18 @@ class OutputSchemaTest < ActiveSupport::TestCase
           type: "array",
           items: {
             properties: { foo: { type: "string" } },
-            required: [:foo]
-          }
+            required: [:foo],
+          },
         })
         assert_equal(
           {
             type: "array",
             items: {
               properties: { foo: { type: "string" } },
               required: ["foo"],
-            }
+            },
           },
-          schema.to_h
+          schema.to_h,
         )
       end
     end