Thanks for this update, as I was not able to reproduce this (but then I did limited testing (of only Python 3.14 IIRC) on Windows. It should be relatively easy to conditionally add '-I', 'MS_WIN64' to extra_compile_args in the sertup.py to test this, and then to add it to setuptools-zig. Finding the right Python version for which this is necessary, and installing those verson will be the bigger challenge (for me)
Installation fails when no gcc is available
I am not sure how ansible uses ruamel.yaml, but I changed it in 0.19.1, that the dependency on ruamel.yaml.clibz is optional and it is only using built-in pure Python. several users/packages did not follow the instructions to have an up-to-date setuptools installed, which is probably the cause for your issue. I try to enforce that now, so this might work for ansible/your environment. I was not aware of ansible using ruamel.yaml, and certainly not that it didn't pin a version they tested as suggested...
Added tag 0.3.7 for changeset a5a426c137b6
update version number in README
Added tag 0.3.6 for changeset 435f7e43dba2
added pyproject.toml to get dependency on recent setuptools
Free-threaded Python support