Problem
Just a temp register that allow user to save something and use it latter. Motivated by the popular pi extension pi-powerline-footer.

Proposed change
hotkey like alt s.
When empty input, if message has been stashed, input is filled with stashed message and stash clears
When empty input, if no stash, show hint "Nothing to stash"
When input is not empty, if message has been stashed, exchange stash and input
When input is not empty, if no stash, input is cleared and stash holds input message

Alternatives considered

Scope check

• This belongs in core reasonix (not better as a separate npm package)
• I've read CLAUDE.md and CONTRIBUTING.md