fix(ci): configure workflow for pure OIDC publishing

Remove registry-url from setup-node to avoid expecting NODE_AUTH_TOKEN.
Pure OIDC publishing uses GitHub's id-token for authentication when
Trusted Publishing is configured on npm.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: kmelve

.github/workflows/release.yml

@@ -30,7 +30,6 @@ jobs:
         with:
           node-version: '22'
           cache: 'pnpm'
-          registry-url: 'https://registry.npmjs.org'
 
       - name: Install dependencies
         run: pnpm install --frozen-lockfile
@@ -52,7 +51,7 @@ jobs:
             echo "exists=false" >> $GITHUB_OUTPUT
           fi
 
-      - name: Publish to npm
+      - name: Publish to npm with provenance (OIDC)
         if: steps.check.outputs.exists == 'false'
         run: npm publish --provenance --access public