Add models CLI config schema

[Nick2bad4u]

Summary

• add a JSON Schema for the models CLI TOML configuration
• register the default models config path in the SchemaStore catalog
• add positive and negative TOML fixtures

Validation

• node ./cli.js check --schema-name=modelsdev.json

[github-actions]

Thanks for the PR!

This section of the codebase is owned by @madskristensen and @hyperupcall - if they write a comment saying "LGTM" then it will be merged.

[hyperupcall]

Thanks! Unfortunately the fileMatch field is too generic and likely to have false positives. Could a more specific pattern work, or is this schema some sort of common standard used across many tools and companies?

[Nick2bad4u]

Removed the generic fileMatch from the catalog entry so this schema is available by URL/manual association without risking false positives. The PR is clean now, and validation is passing.