feat(macos): add Canvas A2UI renderer

vendor/a2ui/specification/0.8/eval/src/schema_matcher.ts

@@ -0,0 +1,24 @@
+/*
+ Copyright 2025 Google LLC
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+      https://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+ */
+
+export interface ValidationResult {
+  success: boolean;
+  error?: string;
+}
+
+export abstract class SchemaMatcher {
+  abstract validate(schema: any): ValidationResult;
+}