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/Sales/Application/Query/ListOrdersByCustomerHandler.php

@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MiniShop\Sales\Application\Query;
+
+use MiniShop\Sales\Application\Port\OrderRepository;
+use MiniShop\Sales\Domain\Model\CustomerId;
+use MiniShop\Sales\Domain\Model\Order;
+
+final readonly class ListOrdersByCustomerHandler
+{
+    public function __construct(
+        private OrderRepository $orderRepository,
+    ) {}
+
+    /** @return list<Order> */
+    public function __invoke(ListOrdersByCustomer $query): array
+    {
+        return $this->orderRepository->findByCustomer(CustomerId::fromString($query->customerId));
+    }
+}