Real windows-latest coverage for the #88136 salvage: probes drive the
actual _git_is_trampoline/_locate_real_git/_ensure_non_trampoline_git
helpers against the runner's genuine Git-for-Windows install plus a real
fork-bomb-guard trampoline stand-in. Wired into the on-demand
windows-venv-e2e lane (wine2e/** pushes only).
Teknium