fix: add GitHub Actions permissions for changesets

- Add contents: write permission for pushing release branches
- Add pull-requests: write permission for creating Version Packages PR
- Resolves permission denied error in changesets workflow

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

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

Author: naivefun

.github/workflows/release.yml

@@ -7,6 +7,10 @@ on:
 
 concurrency: ${{ github.workflow }}-${{ github.ref }}
 
+permissions:
+  contents: write
+  pull-requests: write
+
 jobs:
   release:
     name: Release