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Windows produced an intermediate C:\CI\output\artifacts.zip that upload-artifact then re-zipped (zip-in-zip), while Linux deposited raw files. Make both paths consistent: the build stages raw outputs into a collect dir; collect zips it only as a transport archive, fetches, and extracts into the host artifact dir; actions/upload-artifact produces the single final archive. - _windows_build: param artifact_zip -> output_dir; stage raw files (in-place when source IS the collect dir, else wipe+copy), no Compress-Archive; absolute artifact-source resolved. - _windows_collect: zip guest dir as transport, fetch, extract (mirror _linux_collect); guest_path is now the collect directory. - job.py / build_run CLI: pass output_dir; rename --guest-artifact-zip -> --guest-output-dir. - Tests updated for the raw-file contract. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>