Step 00 — Squelette + intégration naïve

3 Bounded Contexts (Sales, Invoicing, LegacyFulfillment) avec :
- Domaines complets (agrégats, VOs, événements, invariants)
- Couche application (commands, queries, ports)
- Infrastructure in-memory (repos, gateway fake)
- Controllers HTTP Symfony
- Couplage naïf synchrone entre BC via NaiveSalesEventPublisher
- 20 tests unitaires et d'intégration passants

src/LegacyFulfillment/Interfaces/Http/GetShipmentController.php

@@ -0,0 +1,44 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\LegacyFulfillment\Interfaces\Http;
+
+use MiniShop\LegacyFulfillment\Application\Query\GetShipmentByExternalOrderRef;
+use MiniShop\LegacyFulfillment\Application\Query\GetShipmentByExternalOrderRefHandler;
+use Symfony\Component\HttpFoundation\JsonResponse;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\Routing\Attribute\Route;
+
+#[Route('/fulfillment/orders/{externalOrderId}/shipment', name: 'fulfillment_get_shipment', methods: ['GET'])]
+final readonly class GetShipmentController
+{
+    public function __construct(
+        private GetShipmentByExternalOrderRefHandler $handler,
+    ) {}
+
+    public function __invoke(string $externalOrderId): JsonResponse
+    {
+        $shipment = ($this->handler)(new GetShipmentByExternalOrderRef($externalOrderId));
+
+        if ($shipment === null) {
+            return new JsonResponse(['error' => 'Shipment not found.'], Response::HTTP_NOT_FOUND);
+        }
+
+        return new JsonResponse([
+            'orderRef' => $shipment->orderRef->toString(),
+            'status' => $shipment->status()->value,
+            'address' => [
+                'recipientName' => $shipment->address->recipientName,
+                'street' => $shipment->address->street,
+                'city' => $shipment->address->city,
+                'postalCode' => $shipment->address->postalCode,
+                'country' => $shipment->address->country,
+            ],
+            'parcel' => [
+                'weightInGrams' => $shipment->parcel->weightInGrams,
+                'description' => $shipment->parcel->description,
+            ],
+        ]);
+    }
+}