flake/lock: add nixos repo

flake.lock

@@ -138,6 +138,22 @@
         "type": "gitlab"
       }
     },
+    "nixos": {
+      "locked": {
+        "lastModified": 1764831616,
+        "narHash": "sha256-OtzF5wBvO0jgW1WW1rQU9cMGx7zuvkF7CAVJ1ypzkxA=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "c97c47f2bac4fa59e2cbdeba289686ae615f8ed4",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-25.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1764522689,
@@ -200,6 +216,7 @@
       "inputs": {
         "home-manager": "home-manager",
         "nix-xilinx": "nix-xilinx",
+        "nixos": "nixos",
         "nixpkgs": "nixpkgs",
         "nvim": "nvim",
         "project-cloud": "project-cloud",