Function run_suotar_batch_phase 

pub(crate) async fn run_suotar_batch_phase<P: SuotarBatchPhase>(
    phase: &mut P,
    ctx: &PhaseContext<'_>,
    scope: &PhaseScope,
) -> Result<PhaseRunOutcome>

Runs one iteration of a SuotarBatchPhase.

items_processed counts the rows this iteration wrote a decision for: the preflight’s included, the ones another writer had moved on before the answer could be applied excluded. items_failed counts how many of those ended up carrying an error code.