[0.8.1] 2026-06-03

Fixed

• Restore Windows PowerShell 5.1 (Desktop edition) compatibility, which regressed
  in 0.8.0. Get-PSBuildCertificate used the PowerShell 7+-only ternary operator,
  causing the file to fail to parse and the whole module to fail to import under
  Windows PowerShell 5.1 — even though the manifest still declares support for it.
  The ternary is replaced with an if/else expression, and the $IsWindows
  platform guard now treats the absent automatic variable on Desktop edition as
  Windows (matching the existing pattern in Build-PSBuildUpdatableHelp). Behavior
  on PowerShell 7+ is unchanged.