ci: publish to npm with trusted publishing (OIDC) instead of NPM_TOKEN

Author: dhruva-vapi

.github/workflows/publish.yml

@@ -7,14 +7,20 @@ on:
 jobs:
   publish:
     runs-on: ubuntu-latest
+    # npm trusted publishing: npm exchanges the GitHub OIDC token for a
+    # short-lived publish credential, so no NPM_TOKEN secret is needed.
+    permissions:
+      contents: read
+      id-token: write
 
     steps:
       - uses: actions/checkout@v4
 
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: '18'
+          # Trusted publishing needs npm 11.5.1 or later, which Node 24 ships.
+          node-version: '24'
           cache: 'npm'
           registry-url: 'https://registry.npmjs.org'
 
@@ -57,5 +63,3 @@ jobs:
 
       - name: Publish to npm
         run: npm publish
-        env:
-          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}