Remove entity performance optimization section from copilot-instructions

.github/copilot-instructions.md

@@ -1024,18 +1024,6 @@ class MyCoordinator(DataUpdateCoordinator[MyData]):
         )
 ```
 
-### Entity Performance Optimization
-```python
-# Use __slots__ for memory efficiency
-class MySensor(SensorEntity):
-    __slots__ = ("_attr_native_value", "_attr_available")
-    
-    @property 
-    def should_poll(self) -> bool:
-        """Disable polling when using coordinator."""
-        return False  # ✅ Let coordinator handle updates
-```
-
 ## Testing Patterns
 
 ### Testing Best Practices
@@ -1181,4 +1169,4 @@ python -m script.hassfest --integration-path homeassistant/components/my_integra
 pytest ./tests/components/my_integration \
   --cov=homeassistant.components.my_integration \
   --cov-report term-missing
-```
+```