publish.yml github-release job now signs the wheel + sdist via
sigstore/gh-action-sigstore-python (pinned v3.3.0 / 04cffa1d), keyless OIDC,
and attaches the .sigstore.json bundles to the GitHub Release through the
existing dist/* glob. Added id-token: write to the job for OIDC.
PyPI uploads were already attested (Trusted Publishing); Scorecard's
Signed-Releases check inspects GitHub Releases, which only carried bare wheels
-> score 0. .sigstore.json is in Scorecard's recognized signatureExtensions.
Verified: action globs ./dist/*.whl ./dist/*.tar.gz (action.py:202), auto-attach
gated on release-event (we trigger on push:tags) so we upload via dist/* and set
release-signing-artifacts:false. First live proof = next v* tag.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
