fix: link to pi packages

Author: alitariksahin

box/guides/pi-setup.mdx

@@ -2,7 +2,7 @@
 title: "Pi Setup"
 ---
 
-This guide walks you through using [Pi](https://pi.dev) with the [`@upstash/box-pi`](https://www.npmjs.com/package/@upstash/box-pi) extension, which runs every tool call (`bash`, file I/O, and search) inside an Upstash Box. The agent and your model API keys stay on your machine; only tool execution happens in the box.
+This guide walks you through using [Pi](https://pi.dev) with the [`@upstash/box-pi`](https://pi.dev/packages/@upstash/box-pi) extension ([npm](https://www.npmjs.com/package/@upstash/box-pi)), which runs every tool call (`bash`, file I/O, and search) inside an Upstash Box. The agent and your model API keys stay on your machine; only tool execution happens in the box.
 
 <Note>
   This is the inverse of running Pi *inside* a box as a [custom harness](https://github.com/upstash/box/blob/main/packages/sdk/examples/custom-pi-agent.ts). Here, Pi runs locally and only its tools execute remotely.