The 'line' handler applied a t:'error' event immediately and unconditionally,
even when a t:'done' had already arrived (deferred as pendingDone until
close). A job whose real work finished successfully (io.done() called,
e.g. leads already committed by the child) could still end up persisted
and reported as 'error' if something in the child's finally-block cleanup
(closing the lease/db) threw afterward, since main().catch() calls
io.fail() + process.exit(1) in that case — discarding a real success
summary for a cosmetic cleanup failure.
Fix distinguishes this from a genuinely unexplained nonzero exit (process
killed/crashed with no chance to report anything), which two existing
tests deliberately require to still override a done: a new
lateErrorAfterDone flag is only set when an explicit error line follows a
done, and close only trusts the done over a nonzero exit code when that
flag is set.
Found via a full-project audit.
Gustavo
0bae79e1aa