fix(ci): remove registry-url so npm uses OIDC trusted publishing for auth

Author: ihor-sokoliuk

.github/workflows/npm-publish.yml

@@ -21,7 +21,6 @@ jobs:
         uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
         with:
           node-version: '20'
-          registry-url: 'https://registry.npmjs.org/'
 
       - name: Verify npm provenance support
         run: |
@@ -45,9 +44,7 @@ jobs:
         run: npm run build
 
       - name: Publish to npm
-        run: |
-          unset NODE_AUTH_TOKEN
-          npm publish --access public --provenance
+        run: npm publish --access public --provenance
 
   publish-mcp-registry:
     name: Publish to MCP Registry