Add unstable channel and jq

flake.nix

@@ -6,6 +6,10 @@
       url = "github:nixos/nixpkgs/nixos-25.11";
     };
 
+    nixpkgs-unstable = {
+      url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    };
+
     home-manager = {
       url = "github:nix-community/home-manager/release-25.11";
       inputs.nixpkgs.follows = "nixpkgs";