package.json carries the license field, as the template does (closes #65)

Copy package.json from the next branch of sneak/prompts, which adds
"license": "MIT", so yarn install in script/bootstrap no longer warns
about a missing license field in every image build. yarn.lock already
matched the template and is unchanged.

Model: opus-5-5

package.json

@@ -1,4 +1,5 @@
 {
+  "license": "MIT",
   "devDependencies": {
     "prettier": "3.8.1"
   }