agent-codex should launch headless workers with codex exec #2078

Summary

The bundled agent-codex plugin launches Codex worker sessions as codex <prompt>. With the current Codex CLI, that enters the interactive CLI path rather than the non-interactive worker path. For unattended AO workers, the plugin should launch codex exec <prompt>.

Reproduction

Environment observed locally:

• AO CLI: 0.9.2
• @aoagents/ao-plugin-agent-codex: 0.9.1
• Codex CLI: current npm-installed @openai/codex
• Windows process runtime, project configured with agent: codex

Steps:

1. Configure a project with agent: codex.
2. Start AO: ao start --no-dashboard --no-restore.
3. Spawn a prompt worker:
   ao spawn --agent codex --prompt "create a file and run tests"
4. Inspect the spawned process command line.

Observed launch command before local patch:

codex -c check_for_update_on_startup=false --dangerously-bypass-approvals-and-sandbox ... -- '<prompt>'

The worker session was created, but Codex did not perform the requested headless work.

Expected behavior

AO should launch the Codex worker with the non-interactive Codex subcommand:

codex exec -c check_for_update_on_startup=false --dangerously-bypass-approvals-and-sandbox ... -- '<prompt>'

After locally patching the plugin to insert exec, the same AO smoke test spawned a Codex worker that created the requested file and ran npm test successfully.

Proposed fix

In packages/plugins/agent-codex/src/index.ts, initialize the launch command parts as:

const parts: string[] = [shellEscape(binary), "exec"];

and update the existing getLaunchCommand tests accordingly.