fix: use pre-check output for GitHub release condition

The changesets action doesn't set `published=true` when running a
custom npm publish command with no changesets present. Use our own
pre-publish check instead — if the version wasn't on npm before the
workflow ran and the publish step succeeded, create the release.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: G4brym

.github/workflows/release.yml

@@ -64,7 +64,7 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Create GitHub Release
-        if: steps.changesets.outputs.published == 'true'
+        if: steps.check.outputs.published == 'false'
         run: |
           VERSION=$(jq -r .version packages/worker/package.json)
           TAG="v${VERSION}"