Air-gap mirror uses tls internal; guests must trust Caddy's local CA. Serve it at http://<domain>/ca.crt from a world-readable mount (the live pki dir is root-only 0600). build-stack --up mirror|full exports the CA after bring-up; landing page links it. Pre-creates the mount target to avoid a dir bind. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>