/**
 * Tracks channels whose current agent was superseded by a message edit.
 *
 * Usage pattern:
 *   edit-handler: supersededEdits.mark(channel)   — before killing the agent
 *   agent-lifecycle: supersededEdits.check(channel) — in the error handler
 *                    supersededEdits.clear(channel)  — after handling
 */
declare class SupersededEdits {
    private _set;
    /** Mark a channel as superseded by an edit (called before killing the agent). */
    mark(channel: string): void;
    /** Returns true if the channel was marked as superseded. */
    check(channel: string): boolean;
    /**
     * Unmark a channel after the supersede condition has been handled.
     * Returns true if the channel was previously marked, false if it was not.
     */
    clear(channel: string): boolean;
}
export declare const supersededEdits: SupersededEdits;
export {};