integration-pattern-selection

Select integration pattern between services: sync request-response, async queue / pub-sub / streaming, saga orchestration vs choreography, transactional outbox, CDC, polling, webhook, async RPC. Anti-pattern checks (dual-write → outbox, 2PC → saga, sync chains, retry without idempotency, no DLQ). Idempotency + DLQ + circuit breaker mandatory for async.