/**
 * SENSITIVITY — the diamond no simple optimizer ships: not just "what's the best setting?" but "how tightly
 * must you hold each knob, and is this optimum robust or fragile?"
 *
 * A factory or lab can hit the perfect setting once — but in production every variable DRIFTS. If the optimum
 * is a sharp spike, a tiny drift ruins the batch; if it sits on a plateau, you can be sloppy and still win.
 * SENSITIVITY reads the measurements you already collected and reports, per variable: how much the score
 * moves when that variable moves (a local slope), how important it is relative to the others, and the
 * TOLERANCE — how far it may drift before the score drops meaningfully. It then rates the optimum
 * robust / moderate / fragile. That is process-control guidance (Taguchi-style robust design) straight out
 * of the optimization run — actionable for real manufacturing, not just a number.
 *
 * Honest by construction (DIAKRISIS): this is a LOCAL estimate from your own data via distance-weighted
 * regression (it assumes a roughly smooth response near the best, and sharpens with more measurements);
 * it abstains to UNKNOWN when there are too few points. It is decision support, not a guarantee.
 */
import { type Space } from "./space.js";
import { type Observation, type Goal } from "./engine.js";
export interface VarSensitivity {
    name: string;
    sensitivity: number;
    importancePct: number;
    toleranceFrac: number;
    toleranceAbs: number;
}
export interface SensitivityReport {
    n: number;
    best: Observation | null;
    valueRange: number;
    variables: VarSensitivity[];
    robustness: "robust" | "moderate" | "fragile" | "unknown";
    note: string;
}
/** Per-variable sensitivity + tolerance at the best, estimated from the observations. */
export declare function analyzeSensitivity(obs: ReadonlyArray<Observation>, space: Space, goal?: Goal): SensitivityReport;
export declare function sensitivityGauntlet(): {
    score: 0 | 100;
    checks: Array<{
        name: string;
        pass: boolean;
        detail: string;
    }>;
};
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