feat : add task_document migration

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/State/TaskDocumentProcessor.php

@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\State;
+
+use ApiPlatform\Metadata\Operation;
+use ApiPlatform\State\ProcessorInterface;
+
+class TaskDocumentProcessor implements ProcessorInterface
+{
+    public function process(mixed $data, Operation $operation, array $uriVariables = [], array $context = []): mixed
+    {
+        return $data;
+    }
+}