Production-ready airgap Kubernetes environment — 3-zone architecture, 5-layer security (OPA + PSS + NetworkPolicies + Falco + Cosign), Vault HA + cert-manager mTLS, full observability (Prometheus, Loki, Tempo), GitOps with ArgoCD, canary CI/CD via Gitea Actions + Argo Rollouts, chaos testing with Chaos Mesh, and IaC via Terraform + Ansible.