create-event-handlers

Sets up RabbitMQ event publishers and consumers following ModuleImplementationGuide.md Section 9. RabbitMQ only (no Azure Service Bus). Creates publishers with DomainEvent (tenantId preferred), consumers with handlers, naming {domain}.{entity}.{action}, required fields (id, type, version, timestamp, tenantId, source, data). Use when adding event-driven communication, async workflows, or integrating via events.