export interface CursorFile {
    byteCursor: number;
    lastSize: number;
    /** Serialised as an array; hydrate into a Set on read. */
    seenRunIds: string[];
}
export declare class CursorStore {
    private readonly projectRoot;
    private readonly sessionId;
    constructor(projectRoot: string, sessionId: string);
    private path;
    /**
     * Read the stored cursor. Returns the zero-state default on any error
     * (missing file, malformed JSON) — never throws.
     */
    read(): Promise<CursorFile>;
    /**
     * Persist an updated cursor file to disk.
     * Creates .bober/chat/ if it does not exist.
     */
    write(cursor: CursorFile): Promise<void>;
}
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