refactor: formaliza contratos de streaming e ciclo de vida dos provedores

src/voice_assistant/agent/deep_agent.py

@@ -16,7 +16,7 @@ Does not manage:
 
 from __future__ import annotations
 
-from collections.abc import AsyncIterator
+from collections.abc import AsyncGenerator
 from contextlib import aclosing
 
 from deepagents import create_deep_agent
@@ -24,7 +24,7 @@ from langchain_core.messages import HumanMessage
 from langchain_oci import ChatOCIGenAI
 from langgraph.checkpoint.memory import MemorySaver
 
-from voice_assistant.agent.adapter import AgentAdapter
+from voice_assistant.agent.adapter import StreamingAgentAdapter
 
 DEFAULT_SYSTEM_PROMPT = """
 Você é o AgentVoice, um assistente pessoal por voz. Que responde pelo nome de Roberta.
@@ -41,7 +41,7 @@ de ferramentas que não foram executadas.
 """
 
 
-class DeepAgentsAdapter(AgentAdapter):
+class DeepAgentsAdapter(StreamingAgentAdapter):
     def __init__(
         self,
         region: str,
@@ -133,7 +133,7 @@ class DeepAgentsAdapter(AgentAdapter):
         session_id: str,
         turn_id: int,
         text: str,
-    ) -> AsyncIterator[str]:
+    ) -> AsyncGenerator[str, None]:
         if self._closed:
             raise RuntimeError("Deep Agent is closed.")
 
@@ -169,5 +169,5 @@ class DeepAgentsAdapter(AgentAdapter):
         if self._closed:
             return
 
-        self._closed = True
         await self.model.aclose()
+        self._closed = True