Merge feat/rp11-pypi-publish-workflow — RP-11 PyPI publish workflow

Adds .github/workflows/release.yml with CPU PyPI publish active and GPU
publish gated 'if: false' pending Phase E (nvjpeg dlopen rewrite).

See e69f22d for full details.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: zhmiao