System Manager

Allows defining packages, services, and settings in Nix code for atomic, reproducible changes, as demonstrated in the cli_tools.nix example with btop and bat.

Works on non-NixOS distributions like Ubuntu, with experimental flags for others, enabling Nix-style management outside NixOS without vendor lock-in.

Leverages Nix's immutable layers for reliable changes and easy rollbacks, similar to NixOS generations, enhancing system stability.

Reuses existing NixOS modules, providing access to a mature ecosystem without requiring NixOS, as mentioned in the README's philosophy section.