Create an idempotent server bootstrap script that installs packages, hardens security, configures services, and is safe to re-run.
## CONTEXT The first commands run on a fresh server set its security posture and reliability for its whole life. In 2026 a good provisioning script is idempotent, so running it twice causes no harm; it updates packages, creates a non-root sudo user, locks down SSH, configures a firewall, sets the timezone and…
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