Fixed Copilot review feedback

Updated the Source pnpm migration docs and scripts in response to Copilot review comments. The README now documents only the required global tools because Gulp resolves from the repo devDependency through pnpm scripts, and the ship script error message now spells uncommitted correctly.

Author: aileen

README.md

@@ -29,7 +29,7 @@ One neat trick is that you can also create custom one-off templates by adding th
 
 # Development
 
-Source styles are compiled using Gulp/PostCSS to polyfill future CSS spec. You'll need [Node](https://nodejs.org/), [pnpm](https://pnpm.io/) and [Gulp](https://gulpjs.com) installed globally. After that, from the theme's root directory:
+Source styles are compiled using Gulp/PostCSS to polyfill future CSS spec. You'll need [Node](https://nodejs.org/) and [pnpm](https://pnpm.io/). After that, from the theme's root directory:
 
 ```bash
 # install dependencies

package.json

@@ -17,7 +17,7 @@
         "pretest": "pnpm zip",
         "pretest:ci": "pnpm zip",
         "preship": "pnpm test",
-        "ship": "STATUS=$(git status --porcelain); echo $STATUS; if [ -z \"$STATUS\" ]; then pnpm version && git push --follow-tags; else echo \"Uncomitted changes found.\" && exit 1; fi",
+        "ship": "STATUS=$(git status --porcelain); echo $STATUS; if [ -z \"$STATUS\" ]; then pnpm version && git push --follow-tags; else echo \"Uncommitted changes found.\" && exit 1; fi",
         "postship": "git fetch && gulp release"
     },
     "packageManager": "pnpm@11.6.0",