deploy.sh already covers most of the installer (OS detection, Docker setup,
random secret generation, nginx, TLS, image build, pve CLI), so the stage is
about publishing a thin bootstrap rather than writing one from scratch.
Records the decisions taken: the bootstrap detects its environment and
creates an LXC when run on a PVE host, the repository is public, and images
keep being built locally. On a PVE host the node can register itself without
a password via pvesh, reusing the token provisioning from stage 1.
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