- Make inotify-tools Linux-only (not available on Darwin)
- Replace nixfmt-rfc-style with nixfmt (deprecated warning)
- Add flake.lock for reproducible builds
Changes:
- nix/shell.nix: Conditionally include inotify-tools only on Linux
- flake.nix: Use pkgs.nixfmt instead of pkgs.nixfmt-rfc-style
- flake.lock: Lock dependencies for reproducibility
