This commit fixes the fuzz test in the GitHub Actions workflow by correctly scoping it to the `pkg/trix` package. The `go test -fuzz` command can only be run on a single package at a time.
This also corrects the `-run` flag to ensure the fuzz test is executed correctly.
This commit adds a step to the GitHub Actions workflow to generate and upload a test coverage report. It also renames the `Verifyf` function in the `lthn` package to `Verify` to match the Core repository.
