4.2.1

Release notes for 4.2.1.

Released: 2026-07-19

Other Changes

• create-zudo-doc: the shipped zudo-doc-version-bump skill's changelog guidance is now default-language-aware — its primary/secondary subsections are framed around default-language vs. other-locale and present both EN/JA heading sets, so a defaultLang: "ja" scaffold whose primary changelog page seeds ## 未リリース gets guidance that matches the page in front of the reader (9fda96a6)

• create-zudo-doc: the shipped zudo-doc-design-system skill gained a "Palette index convention" section under Tier 1, reconciling the frontmatter's palette-index promise with an actual body section (166daedb)

• Tests: documented the scaffold-skill guard's by-design gaps — DENYLIST is a hand-maintained path-idiom guard that complements (not duplicates) the scaffold-refs integration guard — and retitled a stale parity describe block to reflect its byte-mirror mechanism (c7015fc6)