Make dev private

packages/dev/package.json

@@ -1,7 +1,7 @@
 {
   "name": "@tldraw/dev",
   "version": "0.0.46",
-  "private": false,
+  "private": true,
   "description": "A tiny little drawing app (core).",
   "author": "@steveruizok",
   "license": "MIT",