pub fn default_backend_factory_with_sink(
feral_cfg: FeralConfig,
sink: Arc<Mutex<LinearSolverSummary>>,
) -> LinearBackendFactoryExpand description
Sink-aware variant of default_backend_factory. Identical
dispatch, but the FERAL backend is constructed with a
LinearSolverSummary sink so IpoptApplication can read out
aggregate post-mortem stats (factor counts, fill ratio, extremal
pivots, final inertia) after the solve returns. MA57 ignores the
sink — the HSL backend doesn’t carry the same instrumentation yet.