Model upgrade check opens duplicate issues #60
Description
The checkModelUpgrade function in model-check.ts opens a new GitHub issue every time it runs, regardless of whether a similar issue already exists. This could lead to many duplicate issues about the same model upgrade opportunity, cluttering the repository and creating unnecessary noise. The fix is to first search for existing open issues with a similar title (e.g., using the GitHub API to list issues with the 'model-upgrade' label) and only open a new issue if no matching open issue is found. Alternatively, we could update the existing issue with new information instead of creating a new one. This deduplication will keep the issue tracker clean and focused.