Waxtrace staging already used robocopy (8e1f81b, f95d305) but the
shopfloor-setup baseline, common, _ntlars-backups, type-specific,
pre-install, CMM, and Keyence copies still used xcopy with zero error
visibility. Switch them all to robocopy /E /MT:16 /R:1 /W:1 with
errorlevel-8 warnings so copy failures surface on the WinPE console.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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