/**
 * One-shot verification-catch state.
 *
 * Tracks which messages the verification catcher already examined so a code
 * is never re-copied (IDLE replays, reconnect refetches). Marked after the
 * extraction ATTEMPT regardless of outcome — each message costs at most one
 * body fetch, ever. The on-demand tool does not consult this state.
 *
 * Same file-locking pattern as calendar-state.ts, plus pruning: verification
 * traffic churns much faster than calendar mail, so entries expire after
 * 48 h and the file is capped to the newest 1000 entries.
 */
/** True when the catcher already examined this message. */
export declare function isVerificationProcessed(account: string, mailbox: string, uid: string): Promise<boolean>;
/** Record that this message was examined (found or not). */
export declare function markVerificationProcessed(account: string, mailbox: string, uid: string, found: boolean): Promise<void>;
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