/** Resolve the account-scoped storage root. ACCOUNT_DIR is the canonical
 *  spawn-set var; fall back to PLATFORM_ROOT + ACCOUNT_ID exactly as url-get
 *  does. Returns null when neither is resolvable — the caller throws a precise
 *  error rather than staging a temp file at an empty path. */
export declare function resolveAccountDirFromEnv(): string | null;
export interface KdClassifyParams {
    accountId: string;
    attachmentId: string;
}
export declare function kdClassify(params: KdClassifyParams): Promise<string>;
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