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//! Fidelity-based QN-SPSA with a dense Fubini–Study metric (QFI / 4). mod config; mod estimator; mod metric; mod optimizer; mod state; mod validation; pub use config::QnSpsaConfig; pub use estimator::{QnSpsaSample, qn_spsa_sample}; pub use optimizer::QnSpsa; pub use state::{QnSpsaState, QnSpsaStep, QnSpsaStepReport};