What this adds: A skill for setting up and maintaining multilingual Next.js App Router apps with next-intl. Why it's missing: The repo has no i18n skill at all. This is one of the most common pain points in Next.js projects, and the RSC/client boundary split trips up even experienced developers. What's included:

SKILL.md — RSC vs client boundary rules, middleware setup, TypeScript types, locale switcher, error table references/setup.md — full copy-paste boilerplate (11 files) references/pitfalls.md — static rendering, nested layouts, testing, Colombian peso formatting, Zod i18n