[FEATURE]: Stash on Exit

[martin-braun]

Feature hasn't been suggested before.

• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

I have opencode launched inside a terminal buffer in nvim. If I now close nvim it will close opencode and my prepared prompt will be lost. It would be handy if it would auto-stash my prompt if any kind of exit signal is sent from the outside.