Add ovsx dev dependency for Open VSX Registry publishing

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: exceptionraiser

.github/workflows/publish-extension.yml

@@ -50,7 +50,7 @@ jobs:
       - name: Publish extension package to Marketplace
         env:
           VSCE_TOKEN: ${{ secrets.VSCE_TOKEN }}
-        run: npm run ovsx -- publish -p $VSCE_TOKEN
+        run: npm run vsce -- publish -p $VSCE_TOKEN
 
       - name: Publish extension package to Open VSX Registry
         env: