Hermes
aa4a3f5b7c
Add rollback-sentinel NixOS module that: - Deploys sentinel-check.sh (inline) and nixos-rollback.sh (from file) as system packages - Runs a boot-time systemd oneshot service after multi-user.target with configurable delay — checks Tier-1 services, triggers rollback on failure - Runs a post-rebuild service via activation script after every nixos-rebuild switch - Exposes options for tier1Services, tier2Services, tier3InfoServices, bootDelay, rollbackMode (set-default/rollback-now/dry-run), and enablePostRebuild Module wired into flake.nix for lazyworkhorse and enabled in configuration.nix with standard Tier-1/2 service lists and 120s delay.