Fix Python 3.9 compatibility: Optional instead of pipe union

core/module_registry.py

@@ -6,7 +6,7 @@ import importlib
 import pkgutil
 import logging
 from pathlib import Path
-from typing import List, Dict, Any, Callable
+from typing import List, Dict, Any, Callable, Optional
 from fastapi import FastAPI
 
 logger = logging.getLogger(__name__)
@@ -67,7 +67,7 @@ class ModuleRegistry:
         
         return discovered
     
-    def load_module(self, module_name: str, modules_package: str = "modules") -> ModuleInfo | None:
+    def load_module(self, module_name: str, modules_package: str = "modules") -> Optional[ModuleInfo]:
         """Load a single module and return its info"""
         try:
             full_module_name = f"{modules_package}.{module_name}"
@@ -125,7 +125,7 @@ class ModuleRegistry:
         logger.info(f"Registered {registered}/{len(module_names)} modules")
         return registered
     
-    def get_module(self, name: str) -> ModuleInfo | None:
+    def get_module(self, name: str) -> Optional[ModuleInfo]:
         """Get info about a specific module"""
         return self._modules.get(name)