chore: initialize from backend template 0a6dd0e

docs/runbooks/adapter-adapter-disabled.md

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+---
+title: Runbook — ADAPTER_DISABLED (런타임 어댑터 비활성화 호출)
+category: INTERNAL
+error_codes: [ADAPTER_DISABLED]
+severity: P2
+owner: oncall
+last_updated: 2026-06-15
+status: stub
+---
+
+# Runbook: ADAPTER_DISABLED (`runbook://adapter/adapter-disabled`)
+
+## Symptoms
+
+- HTTP 500 with `error.code=ADAPTER_DISABLED`
+- Code invoked an optional adapter (Kafka/Redis/Slack/Email) that is disabled in this deployment
+
+## Diagnosis
+
+- Check adapter name in log (`adapter_name` field)
+- Review deployment config — which optional adapters are enabled?
+
+## Action
+
+- Enable the adapter in deployment configuration (env flag)
+- Or update application logic to skip disabled-adapter paths
+
+## Escalation
+
+- Escalate to deployment team if adapter should be enabled but isn't
+
+---
+
+> **Stub**: Phase D2 — author body after domain adoption. (feature-operational-runbook-contract D9)