Move all allowUnfreePredicate declarations to global configs to prevent
the "last definition wins" merging issue. Unfree packages are now managed
in two central locations:
- NixOS system packages: nixos/common/global/default.nix
- Home Manager packages: home-manager/sajenim/global/default.nix
- Add CLAUDE.md with comprehensive repository documentation
- Configure claude-code package in editors feature
- Add MCP nixos integration for better Nix ecosystem support
- Include Claude settings with co-authored-by disabled
- Update unfree predicate for proprietary AI tools