Fix Windows PowerShell --help/version checks in Windows CLI integration workflow

[Copilot]

The Windows integration job was failing in the legacy powershell step even when gh-aw.exe --help printed successfully. The failure came from unreliable exit-code handling in that execution path, which caused false negatives and skipped downstream checks.

• Root cause

  • Start-Process ... -PassThru -NoNewWindow in shell: powershell occasionally produced an empty/invalid ExitCode in CI for short-lived commands.

• Workflow execution change (legacy PowerShell only)

  • Replaced Start-Process usage in the two shell: powershell steps (--help, version) with System.Diagnostics.ProcessStartInfo + [System.Diagnostics.Process]::Start(...).
  • Kept explicit 30s timeout behavior (WaitForExit(30000) + kill on timeout).
  • Kept strict non-zero exit handling.

• Scope

  • Only .github/workflows/windows-cli-integration.yml was updated.
  • pwsh and cmd checks remain unchanged.

$psi = New-Object System.Diagnostics.ProcessStartInfo
$psi.FileName = $env:BINARY
$psi.Arguments = "--help"
$psi.UseShellExecute = $false
$proc = [System.Diagnostics.Process]::Start($psi)
if (-Not $proc.WaitForExit(30000)) { $proc.Kill(); throw "TIMEOUT: --help hung for 30s in Windows PowerShell" }
if ($proc.ExitCode -ne 0) { throw "Exit code $($proc.ExitCode)" }

[Copilot]

Pull request overview

This PR updates the Windows CLI integration workflow to make the legacy powershell (powershell.exe / PS 5.x) --help and version checks more reliable by avoiding Start-Process exit-code flakiness in CI.

Changes:

• Replaced Start-Process -PassThru -NoNewWindow with System.Diagnostics.ProcessStartInfo + [System.Diagnostics.Process]::Start(...) for the legacy powershell --help step.
• Replaced Start-Process -PassThru -NoNewWindow with System.Diagnostics.ProcessStartInfo + [System.Diagnostics.Process]::Start(...) for the legacy powershell version step.
• Kept the existing WaitForExit(30000) timeout + kill-on-timeout + non-zero-exit enforcement behavior.

Show a summary per file

File	Description
.github/workflows/windows-cli-integration.yml	Updates legacy Windows PowerShell process launching for --help/version to reduce CI false negatives from unreliable exit-code handling.

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