The salvaged fix covered run_workflow.py and hardware_check.py. The same
locale-default read of user-authored workflow JSON exists in five sibling
scripts (auto_fix_deps, check_deps, extract_schema, health_check,
run_batch) — same bug class, same utf-8-sig fix. Invariant test extended
to pin all nine read sites.
The pdf half of the original PR is superseded: those scripts were
replaced wholesale by the clean-room rewrite (#81890), which ships
UTF-8-explicit I/O enforced by its own invariant test.
36f73df139