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-server/default.nix

@@ -3,11 +3,17 @@
   src,
   stdenv,
   bun,
+  codex ? null,
+  claudeCode ? null,
   makeBinaryWrapper,
   node-gyp,
   nodejs,
+  opencode ? null,
   python3,
   writableTmpDirAsHomeHook,
+  withClaudeCode ? false,
+  withCodex ? false,
+  withOpencode ? false,
 }: let
   common = import ../common.nix {
     inherit
@@ -23,6 +29,9 @@
   pname = "t3code-server";
   version = serverPackageJson.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;
@@ -107,6 +116,13 @@ in
       cp -R --no-preserve=mode packages/shared "$out/libexec/t3code/packages/"
 
       makeWrapper ${lib.getExe nodejs} "$out/bin/t3" \
+        ${lib.optionalString withCodex ''
+          --prefix PATH : "${lib.makeBinPath [ codex ]}" \
+        ''}${lib.optionalString withClaudeCode ''
+          --prefix PATH : "${lib.makeBinPath [ claudeCode ]}" \
+        ''}${lib.optionalString withOpencode ''
+          --prefix PATH : "${lib.makeBinPath [ opencode ]}" \
+        ''} \
         --add-flags "$out/libexec/t3code/apps/server/dist/bin.mjs"
 
       runHook postInstall