feat(🧪): add WebGPU CTS integration for React Native

Add support for running the WebGPU Conformance Test Suite in React Native:

- Add sync-cts.sh script to copy and adapt CTS files for Metro bundler
- Add CTSScreen component with UI for running tests
- Add .gitignore entry for CTS source files (should be synced locally)
- Add README with setup instructions

Note: CTS source files are not committed. Run scripts/sync-cts.sh to
copy them from a local clone of the WebGPU CTS repository.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: wcandillon

apps/example/.gitignore

@@ -14,3 +14,6 @@ dist/*
 local.properties
 msbuild.binlog
 node_modules/
+
+# CTS files (copied from WebGPU CTS repo via scripts/sync-cts.sh)
+src/webgpu-cts/src/

apps/example/metro.config.js

@@ -12,6 +12,7 @@ const customConfig = {
   watchFolders: [root],
   resolver: {
     ...defaultConfig.resolver,
+    sourceExts: [...defaultConfig.resolver.sourceExts, 'cjs'],
     extraNodeModules: {
       'three': threePackagePath,
     },