Just noticed that tests were getting skipped in R CMD CHECK since cmdstanr isn't being installed on runners; I don't see any reason not to add it and run these tests in CI/CD.

   ══ Skipped tests (1) ═══════════════════════════════════════════════════════════
  • {cmdstanr} is not installed (1): 'test-extractors.R:120:3'