`/stop` does not clear background terminals shown by `/ps`

What version of Codex CLI is running?

v0.118.0

What subscription do you have?

Pro

Which model were you using?

gpt-5.4 fast

What platform is your computer?

macOS 26.4

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

Ghostty

What issue are you seeing?

/stop says it stopped all background terminals, but /ps still shows the same zombie terminal afterward.

What steps can reproduce the bug?

1. Ask codex to run a task that creates a background terminal
2. Run /ps
3. Run /stop
4. Run /ps again

The same background terminal is still listed after /stop.

What is the expected behavior?

After /stop, /ps should no longer show that terminal.

Additional information

````
• Stopping all background terminals.

/ps

Background terminals

• ls && find . -maxdepth 2 -name '.csproj' -o -name '.sln' && dotnet build -nolo [...]

• Stopping all background terminals.

/ps

Background terminals

• ls && find . -maxdepth 2 -name '.csproj' -o -name '.sln' && dotnet build -nolo [...]