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

tests/test_voice_pipeline.py

@@ -1,3 +1,5 @@
+from voice_assistant.agent.adapter import StreamingAgentAdapter
+from voice_assistant.tts.adapter import TTSAdapter
 """
 Tests for the Voice Pipeline lifecycle orchestration.
 
@@ -832,7 +834,7 @@ async def test_stream_turn_response_produces_audio_before_agent_finishes():
     is still generating its response.
     """
 
-    class StreamingAgent:
+    class StreamingAgent(StreamingAgentAdapter):
         def __init__(self):
             self.first_delta_sent = asyncio.Event()
             self.release_generation = asyncio.Event()
@@ -848,7 +850,7 @@ async def test_stream_turn_response_produces_audio_before_agent_finishes():
             yield " Estou à disposição."
             self.finished = True
 
-    class StreamingTTS:
+    class StreamingTTS(TTSAdapter):
         async def synthesize(self, text):
             yield text.encode("utf-8")
 
@@ -931,12 +933,12 @@ async def test_stream_turn_response_produces_audio_before_agent_finishes():
 
 @pytest.mark.anyio
 async def test_stream_turn_response_propagates_agent_failure():
-    class FailingStreamingAgent:
+    class FailingStreamingAgent(StreamingAgentAdapter):
         async def stream(self, session_id, turn_id, text):
             yield "Olá, como posso ajudar?"
             raise RuntimeError("Simulated OCI streaming failure.")
 
-    class StreamingTTS:
+    class StreamingTTS(TTSAdapter):
         async def synthesize(self, text):
             yield text.encode("utf-8")
 
@@ -971,7 +973,7 @@ async def test_stream_turn_response_propagates_agent_failure():
 
 @pytest.mark.anyio
 async def test_stream_turn_response_cancels_agent_on_tts_failure():
-    class BlockingStreamingAgent:
+    class BlockingStreamingAgent(StreamingAgentAdapter):
         def __init__(self):
             self.cancelled = asyncio.Event()
 
@@ -982,7 +984,7 @@ async def test_stream_turn_response_cancels_agent_on_tts_failure():
             finally:
                 self.cancelled.set()
 
-    class FailingTTS:
+    class FailingTTS(TTSAdapter):
         async def synthesize(self, text):
             raise RuntimeError("Simulated TTS failure.")
             yield b""  # Keep this method an async generator.
@@ -1023,7 +1025,7 @@ async def test_stream_turn_response_cancels_agent_on_tts_failure():
 
 @pytest.mark.anyio
 async def test_stream_turn_response_external_cancellation():
-    class BlockingAgent:
+    class BlockingAgent(StreamingAgentAdapter):
         def __init__(self):
             self.closed = asyncio.Event()
 
@@ -1034,7 +1036,7 @@ async def test_stream_turn_response_external_cancellation():
             finally:
                 self.closed.set()
 
-    class BlockingTTS:
+    class BlockingTTS(TTSAdapter):
         def __init__(self):
             self.started = asyncio.Event()
             self.closed = asyncio.Event()