Vite plugin — behavior init helper export

Acceptance Criteria

• @refrakt-md/vite/behaviors export path works (package.json exports field)
• initBehaviors(root?: Element) wraps initRuneBehaviors() from @refrakt-md/behaviors
• Works in SPA re-navigation (SvelteKit afterNavigate, Vue onMounted/watch)
• MPA frameworks (Astro) don't need it — behaviors self-init on page load
• @refrakt-md/behaviors is a dependency of @refrakt-md/vite
• TypeScript types exported for the helper

Approach

1. Add src/behaviors.ts — thin wrapper around initRuneBehaviors()
2. Add ./behaviors subpath export in package.json exports field
3. Document usage patterns for SvelteKit, Vue/Nuxt, and Astro in JSDoc

Dependencies

• Create @refrakt-md/vite plugin — Level 1 static transform — package must exist first

References

• Vite Plugin — Framework-Agnostic Rune Integration (Behaviors section)
• packages/behaviors/ — source of initRuneBehaviors()