export interface CompletionEvent {
    runId?: string;
    phase: "complete" | "failed";
    completed: number;
    failed: number;
    durationMs: number;
    timestamp: string;
}
export declare class CompletionTailer {
    private readonly projectRoot;
    private readonly store;
    constructor(projectRoot: string, sessionId: string);
    /**
     * Poll .bober/history.jsonl for new pipeline-complete events since the last
     * persisted byte cursor. Returns only newly-seen completions.
     *
     * Algorithm:
     * 1. stat the file; ENOENT → return [].
     * 2. If stat.size < cursor (rotation/shrink) → readFrom = 0.
     * 3. Read bytes [readFrom, EOF) via Buffer slice.
     * 4. Parse complete lines only (skip partial trailing line).
     * 5. Filter for event === "pipeline-complete"; extract runId via marker.
     * 6. Dedupe against seenRunIds; persist updated cursor + seenRunIds.
     */
    poll(): Promise<CompletionEvent[]>;
}
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