bac4ee69

By: Lucien Huber <im@lcnbr.ch>

mirror Linnest and Kurvst standalone packages

Add a path-filtered GitHub Actions workflow that snapshots the canonical Typst package trees into lcnbr/linnest and lcnbr/kurvst without rewriting their histories. Branch pushes publish to isolated mirror-test branches; main publishes to main.

User requests:
- I already pushed. Lets add the mirror workflow and walk me through the steps in a new jj change
- what if we want to test it on pushes to this branch?
- I want a full test not dry run