/**
 * Credit-exhaustion notifier — writes a marker file so the ADR-303 recovery
 * surface fires on the next appropriate command render, and keeps a short
 * user-visible notification in `~/.ruflo/credit-status.json`.
 *
 * This is NOT the ADR-303 credit-error classifier — that lives in
 * `credit-errors.ts` and reads provider error codes to decide when a
 * credit surface fires *during* a command. This module is the OUT-OF-BAND
 * signal path: the analytics transport detected a credit-exhausted
 * response (HTTP 402 or ADR-303 machine-readable code), and we need to
 * warn the user asynchronously.
 *
 * State is cheap and durable:
 *   ~/.ruflo/credit-status.json = { exhausted: bool, since: ISO, cleared: ISO|null }
 *
 * Cleared automatically when the user opens the enrollment / signup
 * surface, or explicitly via `ruflo funnel credit-clear`.
 */
export declare const CREDIT_STATUS_FILE = "credit-status.json";
export interface CreditStatus {
    exhausted: boolean;
    since: string | null;
    cleared: string | null;
}
/** Read the current credit status. Never throws. */
export declare function readCreditStatus(): CreditStatus;
/**
 * Mark credit as exhausted — idempotent. Sets `since` on the first mark,
 * leaves it alone on subsequent marks so the user sees a stable "since"
 * timestamp until they clear it.
 */
export declare function markCreditExhausted(now?: Date): void;
/**
 * Clear credit-exhaustion status. Called when the user completes signup or
 * runs `ruflo funnel credit-clear`. `cleared` is stamped so the previous
 * `since` remains inspectable for one recovery cycle.
 */
export declare function clearCreditStatus(now?: Date): void;
/**
 * User-facing single-line summary — plain text, no ANSI. Callers style it
 * themselves. Returns null when credit isn't exhausted (no surface).
 */
export declare function creditExhaustedNotice(now?: Date): string | null;
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