Audit every printf() call site in test.c not already covered by the
flagspec-rejection or perror() paths; convert 33 genuine error/warning
messages (expect-jobs, expect-job, wait-primary, help's not-found path,
jobrun/jobsub/jobstart/jobfinish/jobfail validation, resupdate, set) from
stdout to stderr, so a command's successful result data and its
diagnostics never share a stream.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019jaMf9QEwpugH2W9KAuc7f
Rongsong Shen
a98fad24da