/**
 * The decision spectrum. Ordered least to most interventionist: each step to the
 * right demands strictly stronger evidence than the one before it.
 *
 * The guard never enforces. It returns a point on this spectrum as advice, and
 * the host application decides what to do with it.
 *
 * Five rungs, deliberately. `CHALLENGE` is an alias for `INCREASE_FRICTION`, and
 * `deceive` (tarpit, silent failure, decoy data) is a host-side variant of
 * `BLOCK`, both describe how a host executes a treatment, not a new degree of
 * severity, and SG names severity only. D33.
 */
export declare const DECISIONS: readonly ["ALLOW", "OBSERVE", "INCREASE_FRICTION", "RESTRICT", "BLOCK"];
export type Decision = (typeof DECISIONS)[number];
/** Position on the spectrum. Higher means more intervention. */
export declare function severity(decision: Decision): number;
/**
 * When several layers each advise a decision, the strongest one wins.
 *
 * Deliberately a plain maximum rather than a weighted blend: hard constraints
 * and weak signals are typed differently precisely so they are not averaged
 * into one score.
 */
export declare function strongest(decisions: readonly Decision[]): Decision;
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