Add two new agents for the Vue.js ecosystem:
- nuxt-expert.agent.md: Expert Nuxt Developer agent covering Nuxt 3,
Nitro, rendering modes, data fetching, and legacy Nuxt 2 compatibility.
- vuejs-expert.agent.md: Expert Vue.js Frontend Engineer agent covering
Vue 3 Composition API, Pinia, Vue Router, TypeScript integration, and
legacy Vue 2/Options API compatibility.
Both agents use Claude Sonnet 4.5 and follow existing agent conventions.
README.agents.md regenerated via npm run build.
