[loop-cycle] refactor: add docstrings to 20 undocumented classes (#1130) (#1166)

src/integrations/voice/nlu.py

@@ -24,6 +24,7 @@ logger = logging.getLogger(__name__)
 
 @dataclass
 class Intent:
+    """A classified user intent with confidence score and extracted entities."""
     name: str
     confidence: float  # 0.0 to 1.0
     entities: dict