/**
 * ACHIEVABILITY — is the target you WANT even reachable with the knobs you have? Every optimizer chases a
 * better number; none tell you when you're chasing one that the physics can't deliver. If your goal is
 * "yield ≥ 95%" but the best these variables can ever produce is ~88%, you can tune forever and never get
 * there — the answer isn't a better setting, it's a new lever (a variable you aren't yet controlling) or a
 * relaxed target. Knowing that EARLY saves weeks of doomed experiments.
 *
 * ACHIEVABILITY estimates the optimistic CEILING of your response over the whole variable space — a
 * Lipschitz (smoothness) upper bound built from your own measurements — and compares your target against it.
 * Target already met → achieved. Target below the ceiling → reachable, keep going. Target ABOVE even the
 * optimistic ceiling → likely out of reach with these variables; stop tuning, change the experiment.
 *
 * Honest by construction (DIAKRISIS): the ceiling is an OPTIMISTIC estimate from the smoothness of your data,
 * so "unreachable" means "above what your measurements can justify" — not a theorem of impossibility (a sharp
 * spike between samples could exceed it; that's exactly what exploration is for). It abstains when data is
 * thin, and it never cries "impossible" for a target your data already brackets.
 */
import { type Space } from "./space.js";
import { type Observation, type Goal } from "./engine.js";
export interface AchievabilityReport {
    target: number;
    bestSoFar: number;
    ceiling: number;
    feasibility: number;
    verdict: "achieved" | "reachable" | "unreachable" | "unknown";
    note: string;
}
/** Estimate whether `target` is reachable for this objective given the measurements so far. */
export declare function assessAchievability(obs: ReadonlyArray<Observation>, space: Space, target: number, goal?: Goal): AchievabilityReport;
export declare function achievabilityGauntlet(): {
    score: 0 | 100;
    checks: Array<{
        name: string;
        pass: boolean;
        detail: string;
    }>;
};
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