Wrap T3 Code apps with optional agent CLI paths

- Split base desktop/server derivations from wrapper layers
- Add optional PATH injection for codex, claudeCode, and opencode
- Update flake inputs and lock entries for nixpkgs/llm-agents

packages/t3code-desktop/default.nix

@@ -3,6 +3,7 @@
   src,
   asar,
   stdenv,
+  symlinkJoin,
   bun,
   codex ? null,
   claudeCode ? null,
@@ -35,11 +36,7 @@
 
   pname = "t3code-desktop";
   version = desktopPackageJson.version;
-in
-  assert lib.assertMsg (!withCodex || codex != null) "withCodex requires a codex package";
-  assert lib.assertMsg (!withClaudeCode || claudeCode != null) "withClaudeCode requires a claudeCode package";
-  assert lib.assertMsg (!withOpencode || opencode != null) "withOpencode requires an opencode package";
-  stdenv.mkDerivation (finalAttrs: {
+  basePackage = stdenv.mkDerivation (finalAttrs: {
     inherit pname version;
     inherit src;
 
@@ -178,16 +175,9 @@ in
         --set-default ELECTRON_FORCE_IS_PACKAGED 1 \
         --set-default ELECTRON_IS_DEV 0 \
         --prefix PATH : ${lib.makeBinPath [
-          git
-          xdg-utils
-        ]} \
-        ${lib.optionalString withCodex ''
-          --prefix PATH : "${lib.makeBinPath [ codex ]}" \
-        ''}${lib.optionalString withClaudeCode ''
-          --prefix PATH : "${lib.makeBinPath [ claudeCode ]}" \
-        ''}${lib.optionalString withOpencode ''
-          --prefix PATH : "${lib.makeBinPath [ opencode ]}" \
-        ''} \
+        git
+        xdg-utils
+      ]} \
         --add-flags "$out/share/${pname}/resources/app.asar"
 
       export out
@@ -205,4 +195,34 @@ in
       platforms = ["x86_64-linux"];
       sourceProvenance = with lib.sourceTypes; [fromSource];
     };
-  })
+  });
+  withAgentPath = withCodex || withClaudeCode || withOpencode;
+  agentPath = lib.makeBinPath (
+    lib.optionals withCodex [codex]
+    ++ lib.optionals withClaudeCode [claudeCode]
+    ++ lib.optionals withOpencode [opencode]
+  );
+in
+  assert lib.assertMsg (!withCodex || codex != null) "withCodex requires a codex package";
+  assert lib.assertMsg (!withClaudeCode || claudeCode != null) "withClaudeCode requires a claudeCode package";
+  assert lib.assertMsg (!withOpencode || opencode != null) "withOpencode requires an opencode package";
+    if withAgentPath
+    then
+      symlinkJoin {
+        inherit pname version;
+        name = "${pname}-${version}";
+        paths = [basePackage];
+        nativeBuildInputs = [makeWrapper];
+        postBuild = ''
+          wrapProgram "$out/bin/t3code" \
+            --prefix PATH : "${agentPath}"
+
+          rm -f "$out/share/applications/t3code.desktop"
+          install -Dm644 ${basePackage}/share/applications/t3code.desktop \
+            "$out/share/applications/t3code.desktop"
+          substituteInPlace "$out/share/applications/t3code.desktop" \
+            --replace-fail "${basePackage}/bin/t3code" "$out/bin/t3code"
+        '';
+        meta = basePackage.meta;
+      }
+    else basePackage