feat(hot-reload): Implement HotReloader.reload and reload_all

src/hot_reloader.py

@@ -29,4 +29,39 @@ class HotReloader:
     @classmethod
     def restore_state(cls, app: Any, state: dict[str, Any]) -> None:
         for key, value in state.items():
-            setattr(app, key, value)
+            setattr(app, key, value)
+
+    @classmethod
+    def reload(cls, module_name: str, app: Any) -> bool:
+        if module_name not in cls.HOT_MODULES:
+            cls.last_error = f"Module {module_name} not registered"
+            cls.is_error_state = True
+            return False
+
+        hm = cls.HOT_MODULES[module_name]
+        state = cls.capture_state(app, hm.state_keys)
+
+        try:
+            import importlib
+            import sys
+            if module_name in sys.modules:
+                old_module = sys.modules[module_name]
+                importlib.reload(old_module)
+            else:
+                importlib.import_module(module_name)
+            cls.last_error = None
+            cls.is_error_state = False
+            return True
+        except Exception:
+            cls.restore_state(app, state)
+            cls.last_error = traceback.format_exc()
+            cls.is_error_state = True
+            return False
+
+    @classmethod
+    def reload_all(cls, app: Any) -> bool:
+        success = True
+        for name in cls.HOT_MODULES:
+            if not cls.reload(name, app):
+                success = False
+        return success