/**
 * IVTR Breaking-Change Gate — audit trail for nexus risk acknowledgments.
 *
 * Records acknowledgments to `.cleo/audit/nexus-risk-ack.jsonl` when a worker
 * bypasses the nexusImpact gate with `--acknowledge-risk "<reason>"`.
 *
 * @task T1073
 * @epic T1042
 */
/**
 * A single entry in the nexus risk acknowledgment audit file.
 */
export interface NexusRiskAckEntry {
    /** Task ID that was completed despite CRITICAL impact risk. */
    taskId: string;
    /** Symbols with CRITICAL risk that were acknowledged. */
    symbols: Array<{
        symbolId: string;
        symbolName?: string;
        risk: string;
    }>;
    /** Reason provided by the worker for acknowledging the risk. */
    reason: string;
    /** ISO timestamp when acknowledgment was recorded. */
    timestamp: string;
    /** Agent ID that performed the completion (e.g., 'cleo', worker name). */
    agent: string;
}
/**
 * Append a nexus risk acknowledgment entry to the audit file.
 *
 * Creates `.cleo/audit/` directory if it does not exist and atomically appends
 * a single-line JSON entry to `.cleo/audit/nexus-risk-ack.jsonl`.
 *
 * @param entry - The acknowledgment entry to audit
 * @param projectRoot - Absolute path to project root (defaults to getProjectRoot())
 */
export declare function appendNexusRiskAck(entry: NexusRiskAckEntry, projectRoot?: string): Promise<void>;
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