Summary

• Adds GitHub Actions CI for Go tests on pushes and pull requests targeting main.
• Adds regression coverage for the current P0 surface around compat: add variadic functions and dynamic call unpacking #9 and compat: complete starred and rest patterns in match statements #12.
• Covers static tuple star call binding, keyword-only/default argument binding, duplicate keyword diagnostics, list starred match rest, and mapping **rest capture.

CI

• .github/workflows/test.yml runs go mod download and go test ./....
• Go version is resolved from go.mod via actions/setup-go go-version-file.

Notes

This PR is intentionally narrow. It does not yet complete the larger remaining #9 surface such as real *args / **kwargs function parameters.

Related issues

• compat: add variadic functions and dynamic call unpacking #9
• compat: complete starred and rest patterns in match statements #12

Testing

• GitHub Actions: Test workflow queued for the latest commit.
• Local tests were not run in this execution environment.