1.3.0

Added

• Test-VmSshCredential: single-shot authentication probe that returns
  $true when the password is accepted, $false on a definitive
  rejection, and rethrows a transient/unreachable error unchanged. The
  auth-level rung above Test-SshBanner - a banner-reachable host can
  still have no usable login (e.g. first-boot user provisioning failed),
  which only an auth attempt reveals. Connect policy is inherited from
  New-VmSshClient so the probe is indistinguishable from a real session
  at the transport layer.