Annotation not set for Lambda (not using Express)

Hi.

In my lambda handler, I'm trying to set an annotation on a subsegment. I'm not using express.

```JavaScript
const sub = AWSXRay.getSegment().addNewSubsegment('my-handler')

// Rest of my code...

sub.addAnnotation('response', JSON.stringify(response))
```

I can't see this set anywhere though. What am I missing?

Thanks in advance.

Start at the Lambda handler and trace AWSXRay.getSegment(), addNewSubsegment(), and addAnnotation() through the Node.js SDK, focusing on the non-Express path described here. Done means identifying why the annotation is not visible and confirming the expected annotation behavior for this handler.

Written by the indexing model from the issue text.