from abc import ABC, abstractmethod
from typing import Iterator, Dict, Any

class MailIntakeAdapter(ABC):
    @abstractmethod
    def iter_message_refs(self, query: str) -> Iterator[Dict[str, str]]: ...
    @abstractmethod
    def fetch_message(self, message_id: str) -> Dict[str, Any]: ...
    @abstractmethod
    def fetch_thread(self, thread_id: str) -> Dict[str, Any]: ...