/**
 * `Clock` — abstracted time source. Use cases inject it instead of
 * calling `Date.now()` directly so tests can run with a fixed clock
 * and production stays on real time without ceremony.
 *
 * Defaults: `Date.now`. `createMantleRuntime` binds the default; tests override.
 */
export interface Clock {
    now(): number;
}
export declare const SystemClock: Clock;
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