[HANDS-ON BUG] Error in chat completion in unit 1 dummy agent library

**Describe the bug**
Getting error 'the requested model is not a chat model' while running the code given in dummy agent library

**To Reproduce**
```
import os
from huggingface_hub import InferenceClient

HF_TOKEN = os.environ.get("HF_TOKEN")

client = InferenceClient(model="meta-llama/Llama-4-Scout-17B-16E-Instruct")

output = client.chat.completions.create(
messages=[
{"role": "user", "content": "The capital of France is"},
],
stream=False,
max_tokens=20,
)
print(output.choices[0].message.content)
```

getting the error as,
```
Bad request:
{'message': "The requested model 'meta-llama/Llama-4-Scout-17B-16E-Instruct' is not a chat model.", 'type': 'invalid_request_error', 'param': 'model', 'code': 'model_not_supported'}
```

Start by searching the course content for the Unit 1 dummy agent library example and reproduce the shown InferenceClient call with the named model. Check the current Hugging Face model and chat-completion support, then update the example or model reference so the exercise runs successfully and verify the output path.

Written by the indexing model from the issue text.