The .NET3.5/VC++ prereqs block (11 RunSynchronousCommands with ~260-char doubled Paths + a long Description) made the answer file invalid for the specialize pass - 'Windows could not parse or process unattend answer file for pass [specialize]'. Rebuilt the template from the proven-working original with only the OpenText change (Order 19 -> Setup-OpenText.cmd, drop unattended.bat, short Description). Deployed to both live gea-standard + gea-engineer. The prereqs will be re-added correctly as a single short-Path wrapper cmd (install-prereqs.cmd) once imaging is confirmed.
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