workflow_steps.py is a helper module, not a test module, so pytest does not
rewrite its asserts: a replayed bash step that exits non-zero with empty
stdout/stderr fails as a bare 'AssertionError' with no exit code. Two
Windows arm64 os-tests runs (jobs 112635777217, 112764629268) failed this way
on unmodified baseline replays, and the NTSTATUS needed to tell a crashed
child (0xC0000142 / 0xC0000005) from a bash failure was lost. Put rc (decimal
and hex), the bash used, and both streams in the message.
effe2ffa14