- Added `emailOnFailure.enable` option to metacfg with a default of `false`.
- Enabled email notifications on failure for SGX and MX systems.
- Enhanced `systemd-email-notify` module to support the new configuration.
Introduce a NixOS module for sending service status emails on failures via systemd. The module provides configurable options for email recipients and integrates with the `sendmail` utility to notify admins about service issues.
