gemini quota exhausted: fixing regressions in test suite

src/hot_reloader.py

@@ -18,6 +18,8 @@ class HotReloader:
 
     @classmethod
     def register(cls, module: HotModule) -> None:
+        if module.name in cls.HOT_MODULES:
+            raise ValueError(f"Module {module.name} already registered")
         cls.HOT_MODULES[module.name] = module
 
     @classmethod