Two pre-existing CI breakages on develop, both dependency drift — neither a source change.

1. pytest-pydocstyle is archived and breaks under pytest 9.1

CI aborted at pytest startup:

PluginValidationError: Plugin 'pydocstyle' for hook 'pytest_collect_file'
... Argument(s) {'path'} are declared in the hookimpl but can not be found in the hookspec

pytest-pydocstyle's pytest_collect_file still declares the legacy path arg that pytest 9.1 removed from the hookspec. The plugin's upstream is archived, so it will never be fixed — remove it rather than pin pytest back. Docstring linting, if wanted, should move to a maintained tool (ruff's pydocstyle D rules), ideally folded into the project-wide ruff effort.

2. test_xipm_theo fails under numpy ≥ 2.5

With pytest running again, test_cosmo.py::test_xipm_theo fails on Python 3.12 (numpy 2.5.0): pyccl 3.3.4 calls float() on a non-0-d array in boltzmann.py:119, which numpy ≥ 2.5 turns into a hard TypeError. 3.10 passes (numpy 2.2.6). xfail it (conditioned on numpy ≥ 2.5, non-strict) as a stopgap.

The real fix — and the broader question of where cosmology code should live (cs_util.cosmo vs sp_validation's inline re-implementation; note cs_util.cosmo is consumed by shear_psf_leakage) — is tracked in #71.

Verified locally: full suite green under latest pytest with the plugin removed; the numpy ≥ 2.5 xfail path exercised.

— Claude on behalf of Cail