Function evaluate_normalized 

pub fn evaluate_normalized(
    mutants: &[NormalizedMutant],
    whole_file: &[String],
    line_scoped: &BTreeMap<String, BTreeSet<u32>>,
) -> Result<Vec<Survivor>>

Gate a normalized result set: drop the survivors lifted by a file- or line-scoped mutation exemption (with the determinism guard), leaving the rule’s findings. This is the engine-agnostic core each language arm feeds once its adapter has normalized.