Fix reflect crash on modules using glob imports (#1816)

This excludes glob imports when creating a module's mirror

pkl-core/src/main/java/org/pkl/core/runtime/VmTyped.java

@@ -115,7 +115,11 @@ public final class VmTyped extends VmObject {
         if (bodyNode instanceof WrapperNode wrapper) {
           bodyNode = (ExpressionNode) wrapper.getDelegateNode();
         }
-        builder.add(member.getName().toString(), ((ImportNode) bodyNode).getImportUri().toString());
+        // Glob imports (`import*`) don't import a type; they resolve to a mapping.
+        // Exclude them here, consistent with `imports` also not covering import expressions.
+        if (bodyNode instanceof ImportNode importNode) {
+          builder.add(member.getName().toString(), importNode.getImportUri().toString());
+        }
       }
     }
     return builder.build();

pkl-core/src/test/files/LanguageSnippetTests/input/api/reflect6.pkl

@@ -0,0 +1,13 @@
+import "pkl:reflect"
+import* "../../input-helper/globtest/child/*.pkl" as globbed
+
+// regression test for VmTyped.getImports()
+// `member.isImport()` is true for glob imports too, so reflecting a module that
+// uses `import*` previously threw ClassCastException when casting the glob
+// import's body to ImportNode.
+// Glob imports resolve to a mapping rather than a module type, so they are
+// excluded from `imports` (which only reports regular imports).
+res = reflect.Module(module).imports
+
+// the glob import itself still works
+globbedKeys = globbed.keys.toListing()

pkl-core/src/test/files/LanguageSnippetTests/output/api/reflect6.pcf

@@ -0,0 +1,4 @@
+res = Map("reflect", "pkl:reflect")
+globbedKeys {
+  "../../input-helper/globtest/child/moduleC.pkl"
+}

stdlib/reflect.pkl

@@ -201,7 +201,7 @@ external class Module extends Declaration {
   /// Map keys are the identifiers by which imports are accessed within this module.
   /// Map values are the URIs of the imported modules.
   ///
-  /// Does not cover import expressions.
+  /// Does not cover import expressions or glob imports.
   imports: Map<String, Uri>
 
   /// The classes declared in this module.