export type ModelFamilyDerivation = {
    modelId: string;
    modelFamily: string;
    source: 'rule' | 'fallback-hash';
};
/**
 * Resolve a modelId to its provider-family bucket. Pure, deterministic,
 * and total (returns `unknown-<slug>` for unrecognised ids). The slug
 * is the first 8 hex chars of the sha256 of the lowercased modelId —
 * stable across processes and stable across minor version bumps.
 */
export declare function deriveModelFamily(modelId: string): ModelFamilyDerivation;
/**
 * Convenience: returns only the family string. Use `deriveModelFamily`
 * when the caller also wants to know whether a rule matched or whether
 * the fallback path was taken.
 */
export declare function modelFamily(modelId: string): string;