Function pio_package_from_balanced_network 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn pio_package_from_balanced_network(
    net: *const PioNetwork,
    include_solver_metadata: i32,
    errbuf: *mut c_char,
    errlen: usize,
) -> *mut PioPackage

Wrap a balanced PioNetwork handle in a .pio.json package. The C handle name is historical; the payload is powerio::BalancedNetwork. include_solver_metadata != 0 attaches compact normalized solver table metadata.