Ubuntu Noble cloud image compatibility release.\n\nChanges:\n- Write hardening settings to /etc/ssh/sshd_config.d/00-hardening.conf so cloud image drop-ins such as 00-permit-root-password-auth.conf cannot override password/root login hardening.\n- Exclude and clean up the legacy 99-hardening.conf created by older releases.\n- README documents the Ubuntu Noble drop-in priority behavior.