OSC 9;4 support

OSC 9;4 is a terminal escape sequence to report process status.

It’s supported by Windows Terminal, iTerm2 (popular terminal emulator for MacOS), KDE Konsole, and GNOME VTE. I.e. all big Desktop environments’ terminal emulators.

See https://docs.otty.sh/vt/osc/osc-9-4

uv issue: https://github.com/astral-sh/uv/issues/17731