Codex Desktop environments need a "teardown" config

What feature would you like to see?

Codex Desktop added the (extremely useful) idea of environments, but didn't add the ability to set a teardown step/script.

While this wasn't necessary for Codex Web, where the whole environment is destroyed, it is very necessary for local development.

For example, if the environment for a project creates a Docker Compose stack during setup, we would want to run docker-compose down when the environment/worktree is closed out.

Additional information

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