Fix test script to work on macOS default bash

Replace globstar (bash 4.0+) with find for portability.
macOS ships with bash 3.2 which doesn't support globstar.

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

express/tsconfig.json

@@ -9,5 +9,6 @@
         "strict": true,
         "types": ["node"],
         "outDir": "out"
-    }
+    },
+    "exclude": ["**/*.spec.ts", "**/*.test.ts"]
 }