fix(postmerge #5379): qemu-full-install-test 4 Copilot P1 fixes — iter-5.1 marker (was pre-install) + artifact upload + trigger paths + early-exit race#5382

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fix-postmerge-5379-qemu-full-install-test-iter-51-marker-artifact-upload-trigger-path-early-exit-race-otto-cli-2026-05-26Lucent-Financial-Group/Zeta:fix-postmerge-5379-qemu-full-install-test-iter-51-marker-artifact-upload-trigger-path-early-exit-race-otto-cli-2026-05-26Copy head branch name to clipboard