feat: Implement Krux KEF encryption compatibility

src/lib/types.ts

@@ -44,6 +44,7 @@ export type DecryptionParams = {
 export type EncryptionResult = {
     framed: string | Uint8Array;
     pgpBytes?: Uint8Array;
+    kefBytes?: Uint8Array; // Added for Krux binary output
     recipientFingerprint?: string;
     label?: string;
     version?: number;