Add agent CLI wrappers to T3 Code packages

- Wire llm-agents into the flake
- Expose optional codex, Claude Code, and OpenCode paths in desktop and server wrappers

packages/t3code-desktop/default.nix

@@ -4,6 +4,8 @@
   asar,
   stdenv,
   bun,
+  codex ? null,
+  claudeCode ? null,
   electron_40,
   gcc,
   git,
@@ -11,9 +13,13 @@
   makeWrapper,
   node-gyp,
   nodejs,
+  opencode ? null,
   pkg-config,
   python3,
   writableTmpDirAsHomeHook,
+  withClaudeCode ? false,
+  withCodex ? false,
+  withOpencode ? false,
   xdg-utils,
 }: let
   common = import ../common.nix {
@@ -30,6 +36,9 @@
   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: {
     inherit pname version;
     inherit src;
@@ -169,9 +178,16 @@ in
         --set-default ELECTRON_FORCE_IS_PACKAGED 1 \
         --set-default ELECTRON_IS_DEV 0 \
         --prefix PATH : ${lib.makeBinPath [
-        git
-        xdg-utils
-      ]} \
+          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 ]}" \
+        ''} \
         --add-flags "$out/share/${pname}/resources/app.asar"
 
       export out