@cinnamon-msft is there any documentation on your grammar linting? Would like to explore the action and how it works.

@evenstensberg. You should be able to find the action at GitHub.
https://github.com/pelikhan/action-genai-issue-dedup

I guess this will be very costly for non-microsoft projects?

It depends on the project. I didn't really look too deeply.
I'd start: https://docs.github.com/en/billing/concepts/product-billing/github-actions

Any chance that microsoft would like to sponsor webpack with this?

If so, we're only interested of having this in webpack core (https://github.com/webpack/webpack/issues)

The action wasn't built by "Microsoft". There should be some capacity for an open-source project based on the link I shared, but I don't have any ability to sponsor anything.