Why: The user asked to bring proven external skills for document
beautification and content enrichment into the system. Surveying GitHub,
skills.sh and ClawHub found the popular document-editing skills are
proprietary (Anthropic document skills forbid extraction and derivatives),
so the compliant picks are the permissively-licensed leaders: frontend-
design (Apache-2.0, 985.7K installs), canvas-design (Apache-2.0, official
example skill with bundled OFL fonts), copywriting and copy-editing (MIT,
54.7K stars).
Evidence: Seed-time open-spec validation passes for all four vendored
SKILL.md frontmatters (dogfooded by the existing seed tests); anthropic
skill bodies verified byte-identical to the pinned upstream snapshot
(dbd4588f); marketing skills trimmed only of unvendored sibling pointers
and eval artifacts, recorded in per-skill UPSTREAM.md with pinned SHAs;
new provenance test guards license files.
Impact: Built-in skills grow from four to eight and the binary embeds
about 6 MB of font assets; prompt library base.deliverables v9 exposes
the entry points. House-style stays authoritative for Office themes; the
new skills add visual direction, poster/infographic rendering and
copywriting craft. Seeds upgrade existing deployments on next start.
Refs: Dev task feature/vendor-popular-skills