Add contents:write permission to release workflow

GitHub Actions needs explicit permission to create releases.
Adding permissions block to allow release creation.

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

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

Author: xe-nvdk

.github/workflows/release.yml

@@ -5,6 +5,9 @@ on:
     tags:
       - 'v*'
 
+permissions:
+  contents: write
+
 jobs:
   release:
     runs-on: ubuntu-latest