resolveSshConfig and startSshPortForward spawned a hard-coded /usr/bin/ssh,
so SSH config discovery and gateway tunneling failed wherever the system ssh
client lives elsewhere: Windows (built-in OpenSSH under System32\OpenSSH) and
NixOS (/run/current-system/sw/bin).
Route both helpers through the existing resolveSystemBin("ssh", { trust:
"strict" }) resolver, and add the Windows built-in OpenSSH directory to the
resolver's trusted Windows locations (it had System32 but not the
System32\OpenSSH subdirectory where ssh.exe actually ships). Fail closed with
a clear diagnostic when no system ssh client is present.
Closes#83289.
Co-authored-by: Peter Steinberger <steipete@gmail.com>
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