chore: clean imports and restore test coverage

tests/test_agent.py

@@ -4,8 +4,11 @@ from voice_assistant.agent import MockAgentAdapter
 
 
 @pytest.mark.anyio
-async def text_mock_agent_process_text():
-    agent = MackAgentAdapter()
+async def test_mock_agent_process_text():
+    """
+    Verify that the mock Agent returns the expected response.
+    """
+    agent = MockAgentAdapter()
 
     response = await agent.process(
         session_id="session-1",
@@ -21,20 +24,21 @@ async def text_mock_agent_process_text():
 
 @pytest.mark.anyio
 async def test_mock_agent_records_call():
+    """
+    Verify that the mock Agent records its invocation.
+    """
     agent = MockAgentAdapter()
 
     await agent.process(
         session_id="session-1",
         turn_id=7,
-        text= "Olá",
+        text="Olá",
     )
 
-
     assert agent.calls == [
         (
             "session-1",
             7,
             "Olá",
         )
-    ]
-
+    ]