Wire final import declarations through loading

internal/engine/native_filesystem_test.go

@@ -109,7 +109,7 @@ func TestNativeFilesystemNamespaceAndPathFailures(t *testing.T) {
 			t.Errorf("%q diagnostics = %#v", name, diagnostics)
 		}
 	}
-	missingImport := fstest.MapFS{"main.yml": &fstest.MapFile{Data: []byte("configkit: {imports: [{path: host-only.yml}]}\n")}}
+	missingImport := fstest.MapFS{"main.yml": &fstest.MapFile{Data: []byte("configkit: {imports: [{path: host-only.yml, required: true}]}\n")}}
 	_, err := testLoad[importTestConfig](filesystemFile(newNativeNamespace("bundle", missingImport), "main.yml"), Options[importTestConfig]{Imports: true})
 	if err == nil {
 		t.Fatal("missing virtual import fell back to the host filesystem")
@@ -170,9 +170,7 @@ func TestNativeFilesystemRootAndOptionalImports(t *testing.T) {
   imports:
     - path: ../shared.yml
     - path: absent.yml
-      optional: true
     - glob: absent/*.yml
-      optional: true
 `)},
 		"config/shared.yml": &fstest.MapFile{Data: []byte("items: {shared: retained}\n")},
 		"outside.yml":       &fstest.MapFile{Data: []byte("items: {outside: blocked}\n")},