All three ownership-lost call sites in _classify_delivery_outcome computed
ladder_rung=is_retry_run(job) themselves and passed job["id"]; the helper is
the only place that needs the flag, so pass the job and derive it inside.
That removes the duplicated expression (and a mis-indented continuation
line at the third call site) and drops the now-unused function-level
is_retry_run import in _classify_delivery_outcome. The conditional
ladder_rung splat is kept so mark_job_run fakes without the kwarg still
see the same call shape as before. No behaviour change.
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