v1.7.4-accel.7

ci: publish pynec-accel wheels to real PyPI instead of TestPyPI

antennaknobs' Dockerfile and install docs pull pynec-accel (the optional
NEC2 backend) from TestPyPI; moving the whole stack to real PyPI means
pynec-accel must publish there too.

Convert the tag-gated publish-testpypi job to publish-pypi: drop the
test.pypi.org repository-url (the action defaults to upload.pypi.org) and
update the name/comment. Trusted Publishing (OIDC) and skip-existing are
unchanged — only the index changes.

Requires a trusted/pending publisher for project `pynec-accel` on
pypi.org (owner stevenmburns, repo python-necpp, workflow wheels.yml, no
environment). Use the pending-publisher form for the first release, since
the project does not exist on real PyPI yet.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>