add schema sanitizer to test suite, fix interleaved thinking test

- Add test-schema-sanitizer.cjs to run-all.cjs test runner
- Add test:sanitizer npm script for running it individually
- Update test to use renamed cleanSchema function
- Fix interleaved thinking test to not require thinking blocks after
  tool result (model decides when to use visible thinking)

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

package.json

@@ -28,7 +28,8 @@
     "test:caching": "node tests/test-caching-streaming.cjs",
     "test:crossmodel": "node tests/test-cross-model-thinking.cjs",
     "test:oauth": "node tests/test-oauth-no-browser.cjs",
-    "test:emptyretry": "node tests/test-empty-response-retry.cjs"
+    "test:emptyretry": "node tests/test-empty-response-retry.cjs",
+    "test:sanitizer": "node tests/test-schema-sanitizer.cjs"
   },
   "keywords": [
     "claude",