- Match the microsecond-integer (strftime %s%6N) awaiting-agent key format,
fixing the CI failure from float epoch imprecision.
- Assert exactly one ProcessPendingExecutionJob is enqueued and the future row
is not, so an early-fire regression is caught.
- Count the reply-chase follow-up as exactly one so a double-send regression fails.
- Stub the ActionService instance's perform (not new) to raise, exercising the
job's error/retry path rather than only constructor failures.