Add vite-plugin-agentation package

[laulauland]

Hiya, big fan of the agentation plugin! Hope you don't mind the unsolicited PR - I just built this for myself as I mostly work in Vite-land and figured a Vite plugin might be useful for someone else too.

Happy to also keep it in a separate repo if you prefer!

What changes

New package: vite-plugin-agentation

A Vite plugin that automatically injects Agentation during development. It works by:

1. Hooking into Vite's HTML transformation
2. Injecting a script that creates a container and mounts the Agentation component
3. Only running in dev mode (apply: 'serve'), so production builds are unaffected

Usage:

// vite.config.ts
import agentation from 'vite-plugin-agentation'

export default defineConfig({
  plugins: [react(), agentation()]
})

Build setup

• Uses tsup for consistency with the main agentation package
• tsconfig.json aligned with main package conventions
• Declares agentation as peer dependency so npm/pnpm warns if missing

HMR handling

• Properly cleans up React root on HMR dispose
• Removes container element before remounting

Documentation updates

• Added README for the vite-plugin package explaining how it works, options, and when to use it vs direct import
• Updated main README with Vite plugin installation section
• Added "Vite plugin (alternative)" section to the install page on agentation.dev

Commits

1. Add vite-plugin-agentation package to workspace – plugin source, package.json, tsconfig, workspace config
2. Add vite-plugin documentation – README for plugin, updates to main README and docs site
3. Align vite-plugin build config with main package – switch to tsup, align tsconfig
4. Fix plugin code issues – add agentation peer dep, remove dead code, add HMR cleanup

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