DevSecOps, container, and API operational defensive security reference: CI/CD pipeline hardening, secret scanning, IaC misconfiguration detection, SAST/DAST integration, container image scanning, Kubernetes RBAC hardening, container-escape defense, runtime threat detection, OWASP API Top 10 operational defense, WAF rule tuning, and GraphQL/REST depth and rate limiting. Agent-extending skill that amplifies backend, security, and platform-engineering work with production-grade defensive patterns for pipelines, containers, and running APIs. NOT for: offensive techniques (exploit execution, container-escape attack steps, privilege-escalation procedures, attack tooling), dev-time web-app OWASP Top 10 (see moai-ref-owasp-checklist), LLM/AI security (see moai-ref-llm-security), supply-chain provenance and signing (see moai-ref-supply-chain), or general API design (see moai-ref-api-patterns).