feat(nixified-ai): configure comfyui cuda model support

nixos/nixified.ai.nix

@@ -1,4 +1,4 @@
-{ inputs, config, specialArgs, ... }:
+{ inputs, config, pkgs, specialArgs, ... }:
 specialArgs.makeEnable config "myModules.nixified-ai" false {
   imports = [
     inputs.nixified-ai.nixosModules.comfyui
@@ -7,5 +7,16 @@ specialArgs.makeEnable config "myModules.nixified-ai" false {
   services.comfyui = {
     enable = true;
     host = "0.0.0.0";
+    acceleration = "cuda";
+    models = [
+      (pkgs.fetchurl {
+        name = "lustifySDXLNSFW_v20-inpainting.safetensors";
+        url = "https://huggingface.co/andro-flock/LUSTIFY-SDXL-NSFW-checkpoint-v2-0-INPAINTING/resolve/main/lustifySDXLNSFW_v20-inpainting.safetensors";
+        hash = "sha256-YV8hBx9c6PkWQNIlJTGQTOuL+HNmGVIavuSdlKX434Q=";
+        passthru = {
+          comfyui.installPaths = [ "checkpoints" ];
+        };
+      })
+    ];
   };
 }

nixos/overlay.nix

@@ -75,6 +75,15 @@ in
     dontCheckRuntimeDeps = true;
   });
 
+  magma = prev.magma.overrideAttrs (oldAttrs: {
+    # The CUDA codegen step in magma 2.9.0 can segfault when `make generate`
+    # fans out across all cores. Keep the rest of the build parallel.
+    preConfigure = builtins.replaceStrings
+      [ "make -j$NIX_BUILD_CORES generate" ]
+      [ "make -j1 generate" ]
+      oldAttrs.preConfigure;
+  });
+
   # XXX: codex and claude-code are now provided by flakes in nix.nix
   # See the overlay at the end of nixpkgs.overlays in nix.nix