Step 05 — Hardening

- CorrelationId VO pour le tracing inter-BC
- IdempotencyStore (interface + InMemory) pour garde d'idempotence
- correlationId ajouté aux contrats Published Language (retro-compatible par défaut)
- Consumers Invoicing et LegacyFulfillment idempotents avec logging
- MessengerSalesEventPublisher propage les correlationIds
- Tests unitaires idempotence + tests d'intégration consommateurs idempotents

tests/Integration/InvoicingConformistTest.php

@@ -9,6 +9,7 @@ use MiniShop\Invoicing\Infrastructure\Persistence\InMemoryInvoiceRepository;
 use MiniShop\Invoicing\Infrastructure\SequentialInvoiceNumberGenerator;
 use MiniShop\Invoicing\Interfaces\Messaging\WhenOrderConfirmed;
 use MiniShop\Invoicing\Application\Command\IssueInvoiceForExternalOrderHandler;
+use MiniShop\Shared\Technical\InMemoryIdempotencyStore;
 use MiniShop\Shared\Technical\SystemClock;
 use PHPUnit\Framework\TestCase;
 
@@ -27,6 +28,7 @@ final class InvoicingConformistTest extends TestCase
                 new SequentialInvoiceNumberGenerator(),
                 new SystemClock(),
             ),
+            new InMemoryIdempotencyStore(),
         );
 
         $consumer(new OrderConfirmed(