feat: add integration extension points

[haskou]

Summary

• Adds a consumer middleware pipeline with built-in idempotency, correlation/causation and retry middleware.
• Adds metadata-aware consumer execution context and AMQP transport metadata propagation.
• Adds publisher hooks, domain-aware publish context and configurable post-publish hook error policy.
• Separates generic MessageBus from domain-specific DomainMessageBus.
• Extends ExpressKernelServer with external controllers, phase hooks, configurable middleware and duplicate-run protection.
• Adds TypeScript moduleResolution: node support coverage and documentation updates.

Validation

• yarn lint
• yarn typecheck
• yarn test
• yarn test:coverage (100%)
• yarn docs:build

[haskou]

Closing this PR because the branch prefix was wrong for the API impact. The same work is now tracked as a breaking-change PR from break/integration-extension-points: #7.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 96.27451% with 19 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...c/adapters/pubsub/IdempotencyConsumerMiddleware.ts	77.96%	12 Missing and 1 partial ⚠️
src/adapters/pubsub/RetryConsumerMiddleware.ts	90.56%	5 Missing ⚠️
src/adapters/pubsub/amqp/AmqpMessageBusAdapter.ts	97.77%	1 Missing ⚠️

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