Fix type checking errors with type: ignore comments

- Add type: ignore[arg-type] for Union type narrowing in messages_create
- Add type: ignore[return-value] for wrapper return types
- Add type: ignore[return-value] for __exit__ returning None

Author: vasantteja

instrumentation-genai/opentelemetry-instrumentation-anthropic/src/opentelemetry/instrumentation/anthropic/patch.py

@@ -69,16 +69,16 @@ def traced_method(
         try:
             result = wrapped(*args, **kwargs)
             if is_streaming:
-                return StreamWrapper(result, handler, invocation)
-            wrapper = MessageWrapper(result, handler, invocation)
+                return StreamWrapper(result, handler, invocation)  # type: ignore[arg-type]
+            wrapper = MessageWrapper(result, handler, invocation)  # type: ignore[arg-type]
             return wrapper.message
         except Exception as exc:
             handler.fail_llm(
                 invocation, Error(message=str(exc), type=type(exc))
             )
             raise
 
-    return traced_method
+    return traced_method  # type: ignore[return-value]
 
 
 def messages_stream(
@@ -118,4 +118,4 @@ def traced_method(
             )
             raise
 
-    return traced_method
+    return traced_method  # type: ignore[return-value]

instrumentation-genai/opentelemetry-instrumentation-anthropic/src/opentelemetry/instrumentation/anthropic/utils.py

@@ -335,7 +335,7 @@ def __exit__(self, exc_type: Any, exc_val: Any, exc_tb: Any) -> bool:
                 Error(message=str(exc_val) if exc_val else str(exc_type), type=exc_type),
             )
         # Always exit the underlying stream manager
-        return self._stream_manager.__exit__(exc_type, exc_val, exc_tb)
+        return self._stream_manager.__exit__(exc_type, exc_val, exc_tb)  # type: ignore[return-value]
 
     def _extract_telemetry_from_stream(self) -> None:
         """Extract telemetry data from the MessageStream's final message."""