export interface AcpResiduePurgeResult {
    configKeysRemoved: string[];
    envKeysRemoved: string[];
}
/**
 * Best-effort: rewrite config.json / env without retired ACP keys.
 * Safe to call on every start/go/doctor — no-op when nothing to purge.
 */
export declare function purgeRetiredAcpResidue(): Promise<AcpResiduePurgeResult>;
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