`stack test` and `make test` should only run HSpec

per @parsonsmatt

>The only tricky thing we might want to do is make stack test only run the hspec tests, and not the doctest test suite. Or maybe the doctests can just be an executable that we build and run in CI

We should continue to run the doctests in CI but doctests should get flagged out of getting run by default by `stack test` unless explicitly asked for.

Start by locating the Stack and Make configuration behind `stack test` and `make test`, then identify how the HSpec and doctest suites are registered. Verify that the default test commands run only HSpec, while doctests remain available explicitly and continue to run in CI.

Written by the indexing model from the issue text.