v1.4.1

Added

• CITATION.cff: author identity (Nathan Riley + ORCID) and a
  scaffolded identifiers: block ready for the Zenodo concept DOI.
• SECURITY.md with private GHSA reporting policy.
• CONTRIBUTING.md with PR checklist and DCO.
• README badges (CI, license, PyPI).

Changed

• CI: pixi bumped to v0.69.0 to support lock file version 7.
• README badge block unified across the Sigilweaver portfolio.