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The rehearsal vehicle for cluster dual-stack. Unlike k8s-up.sh (1 server + 2 agents, inline INSTALL_K3S_EXEC), this builds 3 control-plane servers with embedded etcd, each configured through /etc/rancher/k3s/config.yaml rendered by labctl's own generate*Config via bin/render-config.js -- the exact production code path. Node 1 cluster-inits; 2/3 join as etcd members (role=infra + server URL, same shape as production worker1/worker2). Carries the audit-policy.yaml the generated config references (byte-identical to audit-policy.ts) -- without it the apiserver silently crash-loops. Validates the embedded config.yaml as YAML before building each seed ISO. Next: rehearse the dual-stack conversion on it (rolling config.yaml change, quorum, mixed control plane, ServiceCIDR pickup). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01DMVzWZgiKW2wquf5z8S1yH