Apply windows_hide_flags() (CREATE_NO_WINDOW; 0 on POSIX) at the
Windows-reachable cua-driver subprocess boundaries: manifest probe,
update checker, CLI fallback transport, doctor health-report spawn,
and the permissions/status runner. Prevents OpenConsole/Windows
Terminal windows flashing into the foreground when spawned from
GUI-backed Gateway/Desktop processes.
The env-probe half of the original PR was already implemented on main
and is not re-applied here.
Salvaged from #62821 by @ZundamonnoVRChatkaisetu (original commits
carried a placeholder 'Claude Code Enterprise' identity; re-authored
to the contributor's GitHub identity).
ZundamonnoVRChatkaisetu
50e27abdd3