Function finish_job 

fn finish_job(
    job: &Job,
    asr_parts: &[String],
    failure: Option<Error>,
    truncated: bool,
    stages: Stages,
    normalizer: Option<&Normalizer>,
) -> JobOutcome

Finish one job: read its token, build the answer, decide its record.

Taking &Job rather than a bare token is what keeps the wiring honest: every read in here is the job’s own, so the worker cannot hand the answer one token and the record another. Drivable by a test over a prejoined job without a loaded model.