fix(resolution): recognize union instantiation

src/resolution/index.ts

@@ -1079,13 +1079,16 @@ export class ReferenceResolver {
       }
 
       // Promote "calls" to "instantiates" when the resolved target is a
-      // class/struct. Languages without a `new` keyword (Python, Ruby)
+      // class/struct/union. Languages without a `new` keyword (Python, Ruby)
       // express instantiation as `Foo()` — extraction can't tell that
       // apart from a function call without symbol info, but resolution
       // can: if `Foo` resolves to a class, the call IS an instantiation.
       if (kind === 'calls') {
         const targetNode = this.queries.getNodeById(ref.targetNodeId);
-        if (targetNode && (targetNode.kind === 'class' || targetNode.kind === 'struct')) {
+        if (
+          targetNode &&
+          (targetNode.kind === 'class' || targetNode.kind === 'struct' || targetNode.kind === 'union')
+        ) {
           kind = 'instantiates';
         }
       }

src/resolution/name-matcher.ts

@@ -2107,6 +2107,7 @@ function findBestMatch(
       if (
         candidate.kind === 'class' ||
         candidate.kind === 'struct' ||
+        candidate.kind === 'union' ||
         candidate.kind === 'interface'
       ) {
         score += 25;