Citation-metadata fix only — no skill content changed.
- Concept DOI corrected everywhere: all "Concept DOI" references pointed to
10.5281/zenodo.20280773, which is actually the v4.1.1 version-specific DOI — it permanently resolves to the v4.1.1 archive (old title, old repository name) instead of the latest version. The true Concept DOI is10.5281/zenodo.20280772, which always resolves to the newest archived release. Corrected in the README DOI badges and BibTeX blocks (both languages), CITATION.cff identifiers, the release checklists, and the v4.1.1 changelog entry's DOI link.
Full details in CHANGELOG.md.