Add Notification Backend Protocol

src/va_agent/dynamic_instruction.py

@@ -8,13 +8,13 @@ from typing import TYPE_CHECKING
 if TYPE_CHECKING:
     from google.adk.agents.readonly_context import ReadonlyContext
 
-    from va_agent.notifications import NotificationService
+    from va_agent.notifications import NotificationBackend
 
 logger = logging.getLogger(__name__)
 
 
 async def provide_dynamic_instruction(
-    notification_service: NotificationService,
+    notification_service: NotificationBackend,
     ctx: ReadonlyContext | None = None,
 ) -> str:
     """Provide dynamic instructions based on pending notifications.