ci: add manual npm publish workflow with workflow_dispatch

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

Author: Anil-matcha

.github/workflows/publish-npm.yml

@@ -0,0 +1,32 @@
+name: Publish to npm
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: "Version to publish (e.g. 0.2.4)"
+        required: true
+
+jobs:
+  publish-npm:
+    name: Publish to npm
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: "20"
+          registry-url: "https://registry.npmjs.org"
+
+      - name: Set version
+        run: |
+          jq --arg v "${{ github.event.inputs.version }}" '.version = $v' npm/package.json > /tmp/pkg.json
+          mv /tmp/pkg.json npm/package.json
+          echo "Publishing npm version ${{ github.event.inputs.version }}"
+
+      - name: Publish
+        run: npm publish --access public
+        working-directory: npm
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}