Fold the four salvaged cases into one predicate truth table (WSL drive
mounts and .cmd shims refused, /mnt/data and /usr/bin accepted) and one
resolver test that walks the real re-scan: PATH interop hands back a
Windows npm first, the scan skips the /mnt/c entry and accepts the native
npm under /mnt/data. Drops the dead `hermes_cli.main._is_windows` patch —
the resolver calls main_install_repair's own `_is_windows`, which is
already False on the POSIX hosts these tests run on.
teknium1