[Release] extensions/window-restarts/

[SYKhayyat]

Release ticket for the ## Unreleased entry in CHANGELOG.md:

extensions/window-restarts/ — when a window exits unexpectedly (a close

you did not just ask for), a broken-window condition is signalled and

the echo area offers the menu: retry respawns the application, undo walks

back the retile, dismiss carries on. Bind the exported *menu* keymap

behind any chord.

Close this issue when the entry is moved into a released version heading, i.e. when this ships in a release.