Function check_multiconductor_to_balanced_lowering 

pub fn check_multiconductor_to_balanced_lowering(
    net: &MulticonductorNetwork,
    options: MulticonductorToBalancedOptions,
) -> MulticonductorToBalancedReadiness

Check whether a multiconductor package is ready for the lowering pass.

This is a preflight only: it reports the assumptions and blockers that the lowering would need to account for, but it does not produce a balanced model and does not append to lowering_history.