feat: Add output schema support to MCP tools

Author: bigdevlarry

tests/Unit/Capability/RegistryTest.php

@@ -602,16 +602,13 @@ public function testExtractStructuredContentReturnsArrayDirectlyForArrayOutputSc
 
         // Assert
         $this->assertNotNull($structuredContent);
-        $this->assertIsArray($structuredContent);
         $this->assertCount(4, $structuredContent);
         $this->assertEquals([
             ['foo' => 'bar'],
             ['foo' => 'bar'],
             ['foo' => 'bar'],
             ['foo' => 'bar'],
         ], $structuredContent);
-        $this->assertEquals('bar', $structuredContent[0]['foo']);
-        $this->assertEquals('bar', $structuredContent[1]['foo']);
     }
 
     private function createValidTool(string $name, ?array $outputSchema = null): Tool