Upgrade dev dependencies and bump CI Node to 22 (#310)

- serve 14.2.0 → 14.2.6
- start-server-and-test 2.0.0 → 3.0.5 (requires Node ≥22)
- vue 2.7.14 → 2.7.16
- vue-server-renderer 2.7.14 → 2.7.16
- vuepress 1.9.9 → 1.9.10
- CI Node 16 → 22 (Node 16 EOL since 2023-09)
- actions/checkout, actions/setup-node, peaceiris/actions-gh-pages → v4
- Ignore local /ce planning artifacts under docs/brainstorms and docs/plans

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: ConorOkus

.github/workflows/build.yml

@@ -17,11 +17,11 @@ jobs:
     steps:
       # Checkout and setup
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Setup
-        uses: actions/setup-node@v3
+        uses: actions/setup-node@v4
         with:
-          node-version: 16
+          node-version: 22
       # Install and build
       - name: Install
         run: npm ci
@@ -30,7 +30,7 @@ jobs:
       # Deploy, limited to the main branch
       - name: Deploy
         if: success() && github.ref == 'refs/heads/main'
-        uses: peaceiris/actions-gh-pages@v3
+        uses: peaceiris/actions-gh-pages@v4
         with:
           publish_dir: ./docs/.vuepress/dist
           github_token: ${{ secrets.GITHUB_TOKEN }}

.gitignore

@@ -4,6 +4,10 @@
 # Production
 /docs/.vuepress/dist
 
+# Local planning artifacts (Claude /ce workflow)
+/docs/brainstorms
+/docs/plans
+
 # Misc
 .DS_Store
 .env.local