Function analog_artifact_from_source 

pub fn analog_artifact_from_source(
    src: &str,
    fn_name: &str,
    target: &AnalogTarget,
) -> Result<AnalogArtifact, AnaLowerError>

The full DAG-lane pipeline for one region function on one target: lower → schedule/certify → place → budget (physical, with the sourced non-ideality model) → behavioral SPICE.