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.
The old check imported json, subprocess and datetime -- all stdlib -- so
its failure condition was unreachable, and its version-reporting helper
check_package was defined and never called. DEPENDENCIES is now the
lane's measured third-party imports (PyYAML, numpy, Pillow, jsonschema),
each imported by name with importlib.metadata version; missing -> rc 1,
broken -> rc 1, usage error -> rc 2. email_validator is not declared:
spark's own email_validator.py is a local stdlib-only module.
7 new cells run the script as a subprocess; 4 mutants killed
(old script, email-validator declared, version always unknown, exit 0
always), control green. Queue Q120 closed with the record appended and
docs/queue-index.md re-rendered in the same commit.
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