/**
 * GUARDIAN — the always-on guardrail that turns Melete from "tune it once" into "watches your system 24/7".
 * A one-and-done optimizer creates value in bursts; a Guardian creates RECURRING value: it runs as a
 * background loop beside a live system, watches a metric you care about (tokens/sec, latency, yield, error
 * rate), and when conditions drift or breach a safe threshold it raises the alarm and proposes a fresh,
 * ROBUST configuration to recover — instead of waiting for a human to notice at 2 a.m.
 *
 * guardianTick() is the heartbeat: feed it the recent metric history + your baseline, and it returns a
 * status (STABLE / DEGRADING / BREACH) and, when warranted, a re-tune recommendation. It is deterministic
 * and dependency-free, so it can run as a daemon anywhere.
 *
 * Honest by construction (DIAKRISIS): the Guardian DETECTS and RECOMMENDS — it proposes a re-tune and hands
 * back the new config; APPLYING that to a production system is the customer's own integration, behind their
 * own safety gate (we never silently push changes to live infrastructure, and we don't claim to). Drift /
 * breach detection is a transparent statistical rule over the metric you supply, with a dead-band so noise
 * alone never trips a false alarm.
 */
export type GuardianStatus = "stable" | "degrading" | "breach" | "unknown";
export interface GuardianVerdict {
    status: GuardianStatus;
    current: number;
    baseline: number;
    driftPct: number;
    recommendRetune: boolean;
    note: string;
}
/**
 * One heartbeat of the guardrail. `history` = recent metric samples (oldest→newest). `lowerIsBetter` for
 * latency/error-rate. `breachFrac`: a drop worse than this fraction of baseline = BREACH (default 0.15).
 */
export declare function guardianTick(history: ReadonlyArray<number>, opts?: {
    baseline?: number;
    lowerIsBetter?: boolean;
    breachFrac?: number;
    degradeFrac?: number;
    window?: number;
}): GuardianVerdict;
export declare function guardianGauntlet(): {
    score: 0 | 100;
    checks: Array<{
        name: string;
        pass: boolean;
        detail: string;
    }>;
};
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