export interface ExternalValidationResult {
    externalId: string;
    valid: boolean;
    errors: string[];
    warnings: string[];
}
/**
 * Validate an external template directory:
 * - metadata.yaml validates against ExternalMetadataSchema
 * - template.docx exists and SHA-256 matches source_sha256
 * - replacements.json is present and valid
 * - clean.json is valid if present
 * - Replacement targets reference metadata fields
 */
export declare function validateExternal(externalDir: string, externalId: string): ExternalValidationResult;
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