AI agent that fixes GDM model validation errors

### Preliminary Checks

- [x] I have searched existing issues for a duplicate feature request and I'm sure this is new.
- [x] I have read and followed [the docs](https://nrel-distribution-suites.github.io/grid-data-models) and still think this is missing.

### Description

Probably a separate repository. It can help users fix model issues quickly.