fix: replace deprecated appimageTools.extractType2 with extract

Also bumps the buzz input (0.5.18 -> 0.5.20), which pulls rust-overlay
fd2ebb9 where the stdenv.isLinux/isDarwin reads were migrated to
stdenv.hostPlatform — eliminating evaluation warnings.

flake.lock

@@ -46,11 +46,11 @@
         "treefmt-nix": "treefmt-nix"
       },
       "locked": {
-        "lastModified": 1785934673,
-        "narHash": "sha256-U/hMY9kkcdxt497yfGuT7+ytrRmE+E15KF6Sc6VrbZo=",
+        "lastModified": 1787717826,
+        "narHash": "sha256-0rWCz6Wc1SqvQFJsqnUF99irDntui4jlnrToPhXKzqI=",
         "owner": "mulatta",
         "repo": "buzz.nix",
-        "rev": "f4bb77a87f1ec10e5ad51cfe6d0c4fca481c0534",
+        "rev": "547c646feb2f58b7866bf64d6509a37db17cd863",
         "type": "github"
       },
       "original": {
@@ -126,26 +126,6 @@
         "type": "github"
       }
     },
-    "openspec": {
-      "inputs": {
-        "nixpkgs": [
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1785371113,
-        "narHash": "sha256-r3fwnb5gMTV9UXBj7bqkKpTZIWwF4AgghULOIv2Fr4c=",
-        "owner": "Fission-AI",
-        "repo": "OpenSpec",
-        "rev": "2b3d368539132be6311e55db58899abbf5306b81",
-        "type": "github"
-      },
-      "original": {
-        "owner": "Fission-AI",
-        "repo": "OpenSpec",
-        "type": "github"
-      }
-    },
     "root": {
       "inputs": {
         "agents": "agents",
@@ -153,8 +133,7 @@
         "buzz": "buzz",
         "nixpkgs": "nixpkgs",
         "nixpkgs-master": "nixpkgs-master",
-        "opencode": "opencode",
-        "openspec": "openspec"
+        "opencode": "opencode"
       }
     },
     "rust-overlay": {
@@ -165,11 +144,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1785820796,
-        "narHash": "sha256-sZXy8mzUMi2cOGulhoW4HWAZB6JhXOAx1x8J4auZFWk=",
+        "lastModified": 1787367552,
+        "narHash": "sha256-YT4Fs2k7bi+7YzuLt93EtIRgjpwHK5ZfsQEIh5dEQSk=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "b6916ba032e02122d6ed3064f40cabe937363d43",
+        "rev": "fd2ebb9cc4323d0c5a1336138dab5c3c5a5d8bd9",
         "type": "github"
       },
       "original": {
@@ -186,11 +165,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1785360170,
-        "narHash": "sha256-XE1lKgQ3eIO3E7zWryqcRsax+mYXod/5RHBn4YaR9YE=",
+        "lastModified": 1786901030,
+        "narHash": "sha256-WSFCsDSE5ffgD2MqzkM2CYjeFiKhRF/dJUN8uedb6YE=",
         "owner": "numtide",
         "repo": "treefmt-nix",
-        "rev": "d1187f8bc71fb8aab02395869ec3f5c1920f75c0",
+        "rev": "27b3b12a8e6375f28ebe122f07d230ca5459bbfa",
         "type": "github"
       },
       "original": {

pkgs/msty-studio/default.nix

@@ -16,7 +16,7 @@
     url = "https://next-assets.msty.studio/app/alpha/linux/MstyStudio_x86_64.AppImage";
     sha256 = "sha256-zJcGK7QEL3ROgVJy13mMdY/437H3Zx8EwSXy7rEhV9w=";
   };
-  appimageContents = appimageTools.extractType2 {inherit pname version src;};
+  appimageContents = appimageTools.extract {inherit pname version src;};
 in
   appimageTools.wrapType2 {
     inherit pname version src;

pkgs/openwork/default.nix

@@ -19,7 +19,7 @@
       else "sha256-I9ayBQDOjfcXMLDza5TsUzN8hujhgVk5E71IabPpiPM=";
   };
 
-  appimageContents = appimageTools.extractType2 {inherit pname version src;};
+  appimageContents = appimageTools.extract {inherit pname version src;};
 in
   appimageTools.wrapType2 {
     inherit pname version src;

pkgs/vibetyper/default.nix

@@ -13,7 +13,7 @@
     url = "https://cdn.vibetyper.com/releases/linux/VibeTyper.AppImage";
     sha256 = "sha256-2Mgy0hBIdy/ATXVwTlBQguhOTKnHGRz7NsmesFgEkHg=";
   };
-  appimageContents = appimageTools.extractType2 {inherit pname version src;};
+  appimageContents = appimageTools.extract {inherit pname version src;};
 in
   appimageTools.wrapType2 {
     inherit pname version src;