Add npm publish workflow triggered on GitHub release

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: icebob

.github/workflows/publish.yml

@@ -0,0 +1,31 @@
+name: Publish to NPM
+
+on:
+  release:
+    types: [published]
+  workflow_dispatch:
+
+permissions:
+  id-token: write
+  contents: read
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Use Node.js 24.x
+        uses: actions/setup-node@v4
+        with:
+          node-version: 24.x
+          registry-url: https://registry.npmjs.org
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Publish
+        run: npm publish --provenance --access public
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}