'exit 0' left C:\CI\build\dist non-existent -> packaging skipped -> Get-BuildArtifacts
could not find artifacts.zip -> all 4 jobs FAIL at artifact collection phase.
New default: 'if not exist dist mkdir dist & echo burnin_ok > dist\marker.txt'
This creates dist\marker.txt relative to C:\CI\build (GuestWorkDir), so the
packaging step finds it, creates artifacts.zip, and Get-BuildArtifacts succeeds.
Also updated docblock: clarify command runs via cmd /c; replace Start-Sleep example
(PS cmdlet, does not work via WinRM cmd) with ping delay equivalent.
Simone
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