Adopt IntegrationEvent pipeline in outbox persistence.

[gustavofreze]

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Summary

What this pull request does.

Related issue

Closes #...

Checklist

• Tests added or updated.
• Documentation updated when applicable.
• composer review passes.
• composer tests passes.

[Copilot]

Pull request overview

This pull request updates the outbox persistence pipeline to operate on integration events (translated from domain events) before payload serialization and insertion, aligning the library with the IntegrationEvent* abstractions from tiny-blocks/building-blocks v4.

Changes:

• Introduces an IntegrationEventTranslators step in repository implementations; domain events without a matching translator are silently skipped.
• Updates payload serialization to work with IntegrationEventRecord (including reflection serializer and serializer resolution).
• Refreshes unit/integration tests and README documentation to demonstrate and validate the new translation + serialization flow, and bumps tiny-blocks/building-blocks to ^4.0.

Reviewed changes

Copilot reviewed 22 out of 22 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
tests/Unit/OrderPlacedSerializer.php	Updates test serializer fixture to accept IntegrationEventRecord.
tests/Unit/InvalidPayloadSerializer.php	Updates invalid-JSON serializer fixture to accept IntegrationEventRecord.
tests/Unit/InMemoryOutboxRepositoryTest.php	Adds translator wiring in unit tests; adds coverage for “no translator => skip”.
tests/Unit/InMemoryOutboxRepositoryMock.php	Implements translation step in the in-memory repository test double.
tests/Models/RefundIssuedTranslator.php	Adds a test translator mapping a domain event to an integration event.
tests/Models/RefundCompleted.php	Adds a test integration event used by refund translation tests.
tests/Models/OrderShipped.php	Adds a test integration event used by order translation tests.
tests/Models/OrderPlacedTranslator.php	Adds a test translator mapping OrderPlaced domain event to OrderShipped integration event.
tests/Integration/RefundIssuedSerializer.php	Updates integration serializer fixture to accept IntegrationEventRecord.
tests/Integration/FallbackOrderPlacedSerializer.php	Updates fallback serializer fixture to accept IntegrationEventRecord.
tests/Integration/DuplicateOrderShipped.php	Adds an integration event used to validate “first translator wins”.
tests/Integration/DuplicateOrderPlacedTranslator.php	Adds a second translator supporting the same domain event for precedence tests.
tests/Integration/DoctrineOutboxRepositoryTest.php	Updates repository construction + assertions to validate translation/skip/precedence behavior.
src/Serialization/SerializedPayload.php	Reorders factory methods (no functional change) to match style/ordering.
src/Serialization/PayloadSerializers.php	Resolves serializers against IntegrationEventRecord instead of EventRecord.
src/Serialization/PayloadSerializerReflection.php	Reflective serializer now serializes the integration event payload.
src/Serialization/PayloadSerializer.php	Public serializer contract now targets IntegrationEventRecord.
src/OutboxRepository.php	Updates contract docs to define translation + skip semantics as part of persistence.
src/Internal/OutboxInsert.php	Inserts now use IntegrationEventRecord fields (event type/revision from integration event).
src/DoctrineOutboxRepository.php	Adds translation step and persists translated integration event records.
README.md	Documents the translation pipeline and how to declare/register integration events + translators.
composer.json	Bumps tiny-blocks/building-blocks to ^4.0 and adds “integration-events” keyword.