chore(nix): adopt new recommended Lix installation

The Lix NixOS module is not needed anymore with this approach.

flake.lock

@@ -250,21 +250,6 @@
         "type": "github"
       }
     },
-    "flakey-profile": {
-      "locked": {
-        "lastModified": 1712898590,
-        "narHash": "sha256-FhGIEU93VHAChKEXx905TSiPZKga69bWl1VB37FK//I=",
-        "owner": "lf-",
-        "repo": "flakey-profile",
-        "rev": "243c903fd8eadc0f63d205665a92d4df91d42d9d",
-        "type": "github"
-      },
-      "original": {
-        "owner": "lf-",
-        "repo": "flakey-profile",
-        "type": "github"
-      }
-    },
     "gitignore": {
       "inputs": {
         "nixpkgs": [
@@ -328,43 +313,6 @@
         "type": "github"
       }
     },
-    "lix": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1751235704,
-        "narHash": "sha256-J4ycLoXHPsoBoQtEXFCelL4xlq5pT8U9tNWNKm43+YI=",
-        "rev": "1d7368585eebaa2c4bdbcb88fe600cfb2239b2c6",
-        "type": "tarball",
-        "url": "https://git.lix.systems/api/v1/repos/lix-project/lix/archive/1d7368585eebaa2c4bdbcb88fe600cfb2239b2c6.tar.gz?rev=1d7368585eebaa2c4bdbcb88fe600cfb2239b2c6"
-      },
-      "original": {
-        "type": "tarball",
-        "url": "https://git.lix.systems/lix-project/lix/archive/release-2.93.tar.gz"
-      }
-    },
-    "lix-module": {
-      "inputs": {
-        "flake-utils": [
-          "flake-utils"
-        ],
-        "flakey-profile": "flakey-profile",
-        "lix": "lix",
-        "nixpkgs": [
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1751240025,
-        "narHash": "sha256-SXUAlxpjPRkArRMHy5+Hdi+PiC+ND9yzzIjiaHmTvQU=",
-        "rev": "8b1094356f4723d6e89d3f8a95b333ee16d9ab02",
-        "type": "tarball",
-        "url": "https://git.lix.systems/api/v1/repos/lix-project/nixos-module/archive/8b1094356f4723d6e89d3f8a95b333ee16d9ab02.tar.gz?rev=8b1094356f4723d6e89d3f8a95b333ee16d9ab02"
-      },
-      "original": {
-        "type": "tarball",
-        "url": "https://git.lix.systems/lix-project/nixos-module/archive/2.93.2-1.tar.gz"
-      }
-    },
     "matrix-appservices": {
       "inputs": {
         "devshell": "devshell",
@@ -520,7 +468,6 @@
         "flake-parts": "flake-parts",
         "flake-utils": "flake-utils",
         "home-manager": "home-manager_2",
-        "lix-module": "lix-module",
         "matrix-appservices": "matrix-appservices",
         "nixos-hardware": "nixos-hardware",
         "nixpkgs": "nixpkgs",

flake.nix

@@ -19,12 +19,6 @@ rec {
 
     nixos-hardware.url = "github:NixOS/nixos-hardware";
 
-    lix-module = {
-      url = "https://git.lix.systems/lix-project/nixos-module/archive/2.93.2-1.tar.gz";
-      inputs.nixpkgs.follows = "nixpkgs";
-      inputs.flake-utils.follows = "flake-utils";
-    };
-
     disko = {
       url = "github:nix-community/disko/latest";
       inputs.nixpkgs.follows = "nixpkgs";

home/shell/direnv.nix

@@ -4,6 +4,7 @@
   programs.direnv = {
     enable = true;
     nix-direnv.enable = true;
+    nix-direnv.package = pkgs.lixPackageSets.stable.nix-direnv;
   };
 
   # for .envrc's in child directories add "source_up"

system/nix.nix

@@ -10,15 +10,22 @@ let
   inherit (inputs.self.outputs) nixConfig;
 in
 {
-  imports = [
-    # TODO switch to lixFromNixpkgs once 2.93.2 is available
-    inputs.lix-module.nixosModules.default
-    # inputs.lix-module.nixosModules.lixFromNixpkgs
-  ];
-
   nixpkgs.config.allowUnfree = true;
 
+  nixpkgs.overlays = [
+    (final: prev: {
+      inherit (final.lixPackageSets.stable)
+        nixpkgs-review
+        # nix-direnv # HINT infinite recursion, overwritten in home-manager config instead
+        nix-eval-jobs
+        nix-fast-build
+        colmena
+        ;
+    })
+  ];
+
   nix = {
+    package = pkgs.lixPackageSets.stable.lix;
     settings = {
       trusted-users = [ "@wheel" ];
       substituters = nixConfig.extra-substituters;