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.
