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The Windows manual smoke used --guest-artifact-source 'C:\ci\workspace\artifact.txt' (a stale absolute path that does not exist in the build flow; workdir is C:\CI\build). The build command writes artifact.txt into the workdir, so the source must be relative 'artifact.txt' — matching the Linux example. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>