fix: change rigging decorator agent to o3-mini

[GangGreenTemperTatum]

updates rigging PR decorator agent generator ID to o3-mini

Key Changes:

sensical changed based on recent change in model manifest https://community.openai.com/t/openai-dropped-price-of-o3/1284255

• updates rigging PR decorator agent generator ID to o3-mini

Changed:

• updates rigging PR decorator agent generator ID to o3-mini

---

Generated Summary:

• Updated the default generator_id from "groq/meta-llama/llama-4-scout-17b-16e-instruct" to "o3-mini" in generate_pr_description.py.
• This change ensures that the PR description generation uses the new generator identifier by default.

This summary was generated with ❤️ by rigging

[linear]

ENG-2230 AIRTBench rigging PR decorator - `BadRequestError: litellm.BadRequestError: GroqException`

│ │                  message = '{"error":{"message":"Invalid API             │ │
│ │                            Key","type":"invalid_request_error","code":"… │ │
│ │                 messages = "[{'role': 'user', 'content': 'Analyze the    │ │
│ │                            provided git diff and create a PR desc"+20    │ │
│ │                    model = 'groq/meta-llama/llama-4-scout-17b-16e-instr… │ │
│ │       original_exception = OpenAIError('{"error":{"message":"Invalid API │ │
│ │                            Key","type":"invalid_request_error","code":"… │ │
│ ╰──────────────────────────────────────────────────────────────────────────╯ │
╰──────────────────────────────────────────────────────────────────────────────╯
BadRequestError: litellm.BadRequestError: GroqException - 
{"error":{"message":"Invalid API 
Key","type":"invalid_request_error","code":"invalid_api_key"}}

https://github.com/dreadnode/AIRTBench-Code/actions/runs/15620202279/job/44002889116?pr=17