899ce4d put both pre-repair blobs back; both cells read red at HEAD (CHECK-env-verifiers 9 failures, test_python_env_check 5 failures + 2 errors). Restored byte-identically from ebba640 and bda365c. New closed_artifact_guard.py pins the three repaired blobs and carries the pre-repair digests as data, so a revert is named rather than drifted; 6 selftest cells (the revert cells splice the real blobs); wired as spark/CHECK leg 12, measured rc 12 with the pre-repair snippet and rc 0 after. Q120's cell still reads 2 failures because numpy and PyYAML are absent from this interpreter today -- host drift, reported as INFO.
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1cb001a350