Every copy/robocopy during the W: staging phase now appends to
W:\Enrollment\winpe-staging.log (persists as C:\Enrollment\ post-boot).
robocopy gets /LOG+ to append its file list; echo lines log timestamps
for each stage. Helps diagnose missing-file issues post-imaging.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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