export interface ModelOutcomeRecord {
    ts: number;
    task: string;
    model: string;
    outcome: string;
    quality?: number;
}
/** Append a model routing outcome. Opportunistically trims the file to
 *  MAX_MODEL_RECORDS lines to prevent unbounded growth. */
export declare function recordModelOutcome(baseDir: string, rec: ModelOutcomeRecord): Promise<void>;
/** Read all outcome records (for stats). */
export declare function readModelOutcomes(baseDir: string): Promise<ModelOutcomeRecord[]>;
export interface ModelStats {
    totalDecisions: number;
    modelDistribution: Record<string, number>;
    successRate: number | null;
    byModel: Record<string, {
        count: number;
        successRate: number | null;
    }>;
    avgQuality: number | null;
}
/** Compute real aggregate statistics from the recorded outcomes. */
export declare function computeModelStats(baseDir: string): Promise<ModelStats>;
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