Issue: Tests Fail Due to Missing setuptools_scm in OA Template

Description

After creating a package using the OpenAstronomy packaging-guide template and installing it in editable mode, running tests with pytest fails with the following error:

ModuleNotFoundError: No module named 'setuptools_scm'

The issue likely arises because the test environment attempts to access files inside the _dev directory, which depends on setuptools_scm. However, setuptools_scm is not required in the test environment. This issue is resolved locally when setuptools_scm is manually installed, but when running the pytest CI workflow, the error persists:

pkgname/_dev/scm_version.py:6: in <module>
    from setuptools_scm import get_version
 ModuleNotFoundError: No module named 'setuptools_scm'

Workarounds

The issue can be resolved by:

• Manually pip installing setuptools_scm in the environment.
• Adding setuptools_scm to the package dependencies.
• Excluding the _dev directory from pytest by adding the following to pyproject.toml:

  [tool.pytest.ini_options]
  norecursedirs = ["pkgname[\\/]_dev"]
  

Expected Behavior

• The package should install and test successfully without manually installing setuptools_scm.
  - The test environment should not require files inside _dev

Environment

• Latest OA template
• Python Version: 3.13.2 | packaged by conda-forge | [Clang 18.1.8 ]
• OS: Darwin 24.3.0
• Pip Version: 25.0.1
• Pytest Version: 8.3.5

I have tried creating the package multiple times and encountered this issue consistently, but I'm unsure of the root cause within the template. The last fix (i.e., norecursedirs) seems like a global workaround, though I'm curious if this error is reproducible on a different machine.