load_certificates now reads PKCS #7 certificate bundles (degenerate
SignedData, RFC 5652 §5.2) in DER and as PEM PKCS7/CMS blocks, the way
Windows, Acrobat and certificate authorities export chains. PEM END
lines must match their BEGIN label.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>