When skills are loaded they are injected as user.message entry in events.jsonl file

```
"parentId":"3dc970d5-9100-412d-8791-36299eec61ce"}
{"type":"user.message","data":{"content":"<skill-context name=\"monitor-pr\">\nBase directory for this skill: /Users/
```

Reported here https://github.com/microsoft/vscode/issues/310781 & here https://github.com/microsoft/vscode/issues/310897