init: 클린 아키텍처 백엔드

docs/runbooks/dependency-timeout.md

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+---
+title: Runbook — DEPENDENCY_TIMEOUT (외부 의존성 타임아웃)
+category: TRANSIENT_DEPENDENCY
+error_codes: [DEPENDENCY_TIMEOUT]
+severity: P1
+owner: oncall
+last_updated: 2026-06-15
+status: stub
+---
+
+# Runbook: DEPENDENCY_TIMEOUT (`runbook://dependency/timeout`)
+
+## Symptoms
+
+- HTTP 504 with `error.code=DEPENDENCY_TIMEOUT`
+- Upstream service did not respond within configured timeout (default: global 10s)
+
+## Diagnosis
+
+- Check `dependency_name` in log for which upstream is timing out
+- Review upstream service latency metrics
+
+## Action
+
+- Check upstream service health
+- Verify timeout settings match SLA expectations
+
+## Escalation
+
+- P1 if critical upstream is timing out at scale
+
+---
+
+> **Stub**: Phase D2 — author body after domain adoption. (feature-operational-runbook-contract D9)