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

tests/test_gateway.py

@@ -1,3 +1,5 @@
+from voice_assistant.agent.adapter import StreamingAgentAdapter
+from voice_assistant.tts.adapter import TTSAdapter
 import asyncio
 from concurrent.futures import ThreadPoolExecutor
 from contextlib import contextmanager
@@ -1858,12 +1860,12 @@ def test_websocket_streaming_agent_and_tts():
     """
     created_stt.clear()
 
-    class StreamingTestAgent:
+    class StreamingTestAgent(StreamingAgentAdapter):
         async def stream(self, session_id, turn_id, text):
             yield "Olá, como posso ajudar?"
             yield " Estou à disposição."
 
-    class StreamingTestTTS:
+    class StreamingTestTTS(TTSAdapter):
         async def synthesize(self, text):
             yield text.encode("utf-8")
 
@@ -1961,11 +1963,11 @@ def test_websocket_interrupt_during_streaming_tts():
     tts_started = threading.Event()
     tts_cancelled = threading.Event()
 
-    class SlowStreamingAgent:
+    class SlowStreamingAgent(StreamingAgentAdapter):
         async def stream(self, session_id, turn_id, text):
             yield "Olá, esta é uma resposta longa."
 
-    class SlowStreamingTTS:
+    class SlowStreamingTTS(TTSAdapter):
         async def synthesize(self, text):
             try:
                 tts_started.set()
@@ -2100,11 +2102,11 @@ def test_websocket_session_end_during_streaming_tts():
 
     tts_cancelled = threading.Event()
 
-    class SlowStreamingAgent:
+    class SlowStreamingAgent(StreamingAgentAdapter):
         async def stream(self, session_id, turn_id, text):
             yield "Esta é uma resposta longa."
 
-    class SlowStreamingTTS:
+    class SlowStreamingTTS(TTSAdapter):
         async def synthesize(self, text):
             try:
                 yield b"\x01\x02\x03\x04"
@@ -2297,11 +2299,11 @@ def test_websocket_interrupt_wins_pending_tts_completion():
 
     tts_cancelled = threading.Event()
 
-    class ControlledAgent:
+    class ControlledAgent(StreamingAgentAdapter):
         async def stream(self, session_id, turn_id, text):
             yield "Esta resposta será interrompida."
 
-    class ControlledTTS:
+    class ControlledTTS(TTSAdapter):
         async def synthesize(self, text):
             try:
                 yield b"\x01\x02\x03\x04"