(fix): always call castingAfter in createDocument regardless of relationship hook

castingAfter was only called when a Relationships hook was registered,
but it's needed unconditionally to convert adapter-specific types (like
MongoDB UTCDateTime) to PHP types. Without it, BSON objects leak into
document responses.

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

Author: abnegate

src/Database/Traits/Documents.php

@@ -437,9 +437,10 @@ public function createDocument(string $collection, Document $document): Document
         if ($hook !== null && ! $hook->isInBatchPopulation() && $hook->isEnabled()) {
             $fetchDepth = $hook->getWriteStackCount();
             $documents = $this->silent(fn () => $hook->populateDocuments([$document], $collection, $fetchDepth));
-            $document = $this->adapter->castingAfter($collection, $documents[0]);
+            $document = $documents[0];
         }
 
+        $document = $this->adapter->castingAfter($collection, $document);
         $document = $this->casting($collection, $document);
         $document = $this->decode($collection, $document);