Event-Driven Workflow Orchestrator

Design an event-driven workflow for {{process_name}} with these steps:
{{steps}}

Requirements:
- Max latency: {{max_latency}}
- Failure tolerance: {{failure_tolerance}}
- Audit trail for {{compliance_requirement}}
- Technology stack: {{tech_stack}}

Provide:
1. State machine diagram (state transitions & triggers)
2. Retry & backoff strategy
3. Idempotency keys for {{idempotency_scope}}
4. Dead-letter handling & alerting
5. Observability checklist (logs, spans, metrics)