Trigger CI on claude/** branches for testing

https://claude.ai/code/session_01QmPirfEXJ1bsJHb9i98uGS

Author: claude

.github/workflows/build.yml

@@ -2,7 +2,7 @@ name: Build Core
 
 on:
   push:
-    branches: [main]
+    branches: [main, claude/**]
   pull_request:
     branches: [main]