chore(chat): claude 4.0 sonnet model migration for duo chat (!2697) · Merge requests · GitLab.org / ModelOps / AI Assisted (formerly Applied ML) / Code Suggestions / AI Gateway · GitLab

What does this merge request do and why?

This MR introduces a new AI Gateway Prompt config files for Duo Chat that use the claude-4-0-sonnet model by default.

For the complete migration process, see gitlab-org/gitlab#545491 (closed).

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

Merge request checklist

Tests added for new functionality. If not, please raise an issue to follow up.
Documentation added/updated, if needed.