A separate home for concept work before it touches production code.

This app is the internal staging ground for messaging studies, feature vignettes, and prototype exploration that do not belong inside the main product by default.

First-pass rules

Deployment protection lives at Vercel, not inside the app.
`pnpm dev` stays focused on the existing three-app workflow.
Prototype files move over in small, reviewable chunks.

Bootstrap and deploy

Stand up the app, wire Vercel deployment protection, and map the playground subdomain.

Move prototype surfaces in chunks

Start with `/features`, then migrate low-coupling concepts before touching product-adjacent ones.

Copy what proves useful

Treat `slider-app` as source material, not a hard dependency boundary, so the playground stays cheap.