feat: add traycer desktop package

Traycer is an open-source AI orchestration desktop app (Electron).
Packaged from the upstream AppImage via appimageTools.wrapType2,
matching the existing loop package pattern.

packages/traycer/package.nix

@@ -0,0 +1,56 @@
+{
+  lib,
+  appimageTools,
+  fetchurl,
+}:
+
+let
+  version = "1.1.10";
+  src = fetchurl {
+    url = "https://github.com/traycerai/traycer/releases/download/desktop-v${version}/traycer-desktop-linux-x86_64.AppImage";
+    hash = "sha256-+aSlqX1RCpbKuV0j7xEBMQDAq/IzpvCC5XZ/psQJcjY=";
+  };
+  appimageContents = appimageTools.extractType2 {
+    pname = "traycer";
+    inherit version src;
+  };
+in
+
+appimageTools.wrapType2 {
+  pname = "traycer";
+  inherit version src;
+
+  extraPkgs = pkgsWith: [
+    pkgsWith.gtk3
+    pkgsWith.glib
+  ];
+
+  extraInstallCommands = ''
+    mkdir -p $out/share/applications
+    install -m 444 ${appimageContents}/traycer-desktop.desktop $out/share/applications/traycer.desktop
+    substituteInPlace $out/share/applications/traycer.desktop \
+      --replace-fail 'Exec=AppRun --no-sandbox %U' 'Exec=traycer --no-sandbox %U'
+
+    mkdir -p $out/share/icons/hicolor
+    cp -r ${appimageContents}/usr/share/icons/hicolor/* $out/share/icons/hicolor/
+  '';
+
+  passthru = {
+    category = "AI Coding Agents";
+    updateScript = [
+      "nix-update"
+      "--flake"
+      ".#traycer"
+    ];
+  };
+
+  meta = {
+    description = "Open-source AI orchestration app for agentic coding";
+    homepage = "https://github.com/traycerai/traycer";
+    license = lib.licenses.mit;
+    maintainers = [ ];
+    platforms = [ "x86_64-linux" ];
+    mainProgram = "traycer";
+    sourceProvenance = [ lib.sourceTypes.binaryNativeCode ];
+  };
+}