When codex exec receives a prompt as a positional argument, it still
tries to read additional input from stdin (prints 'Reading additional
input from stdin...'). With stdio stdin set to 'ignore' or default,
codex blocks indefinitely waiting for stdin that never comes.
Fix: use stdio ['pipe', 'pipe', 'pipe'] and immediately close stdin
via child.stdin.end() in both execute.ts (sync) and jobs.ts (async).
This signals EOF to codex so it proceeds with the positional prompt.
stefano
017eb1b410