Allow codex resume to resume exec sessions

What version of Codex CLI is running?

codex-cli 0.114.0

What subscription do you have?

API

Which model were you using?

gpt-5.3-codex

What platform is your computer?

linux

What terminal emulator and version are you using (if applicable)?

_No response_

What issue are you seeing?

codex resume doesn't show session that's started by codex exec. I also tried codex resume --all and it's not there either. However, I could run codex exec <session-id> to resume the session where the session id can be found at the top of codex exec.

IMO, we still keep the current behavior for codex exec (i.e. not show exec session) to keep it clean and show exec session in codex resume --all.

What steps can reproduce the bug?

codex exec hello

codex resume --all
# or codex resume

What is the expected behavior?

_No response_

Additional information

_No response_