from typing import Any, List

class MemoryService:
    def __init__(self, context: Any):
        self.context = context

    async def start(self):
        # Stub service setup
        pass

    async def stop(self):
        # Stub service teardown
        pass

    def reset(self):
        # Stub state reset
        pass

    async def retrieve(self) -> List[Any]:
        # Stub for context retrieval, long-term memory, etc.
        return []