Complete Vue 2 to Vue 3 migration toolkit with automated analysis and step-by-step guidance. Use this skill when: (1) Upgrading a Vue 2 project to Vue 3, (2) Converting Options API to Composition API, (3) Migrating Vue Router 3 to 4, (4) Migrating Vuex to Pinia, (5) Converting Vue CLI project to Vite, (6) Analyzing Vue 2 codebase for breaking changes, (7) User asks about Vue 2/3 differences or migration strategy.