feat(domain-intelligence): add domain intelligence lookups with RDAP and DNS enrichment

test/test.ipintelligence.ts

@@ -65,6 +65,13 @@ tap.test('should use cache when cacheTtl is set', async () => {
   // Second call should return the same cached result
   expect(r1.asn).toEqual(r2.asn);
   expect(r1.countryCode).toEqual(r2.countryCode);
+  await cached.stop();
+});
+
+tap.test('should stop cleanly (tears down shared smartdns client)', async () => {
+  // If the Rust-backed smartdns bridge wasn't destroyed, this test process
+  // would hang at exit instead of completing.
+  await testSmartNetwork.stop();
 });
 
 export default tap.start();