feat(host): resolve published interface references

crates/wip-host/tests/host.rs

@@ -163,6 +163,11 @@ fn registry_exposes_opaque_validated_descriptor_observations() {
     let reader = registry.register(ReaderDefinition, None).unwrap();
 
     assert_ne!(reader.reference().as_str(), "Reader");
+    assert_eq!(
+        registry.resolve(reader.reference().as_str()).as_ref(),
+        Some(reader.reference())
+    );
+    assert!(registry.resolve("wip-interface:unknown:0").is_none());
     let observation = registry.observe(reader.reference()).unwrap();
     assert_eq!(observation.reference, *reader.reference());
     assert_eq!(observation.descriptor.name, reader.reference().as_str());
@@ -174,6 +179,11 @@ fn registry_exposes_opaque_validated_descriptor_observations() {
     let mut other_registry = InterfaceRegistry::new();
     let other_reader = other_registry.register(ReaderDefinition, None).unwrap();
     assert_ne!(reader.reference(), other_reader.reference());
+    assert!(
+        registry
+            .resolve(other_reader.reference().as_str())
+            .is_none()
+    );
 }
 
 #[test]