Retain rootfs closure during in-place deployment - #45
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/etcentries link into the rootfs derivation, but only the intermediateetcderivation was registered in Nix’s database. GC therefore collected the live rootfs, leaving/etc/passwdand CA certificates dangling. Register the rootfs closure itself.\n\nRestore ordinary OpenSSH for deployment after a Tailscale ping preflight; Tailscale SSH cannot map users while/etc/passwdis broken. Keep its probe as non-blocking diagnostics.