/**
 * Store the encryption key in the OS keychain.
 * - macOS: Keychain
 * - Linux: libsecret
 * - Windows: Credential Vault
 */
export declare function storeKey(repoId: string, key: Buffer): Promise<void>;
/**
 * Retrieve the encryption key from the OS keychain.
 */
export declare function retrieveKey(repoId: string): Promise<Buffer | null>;
/**
 * Remove the stored key (for password change or cleanup).
 */
export declare function removeKey(repoId: string): Promise<void>;
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