Fix CI: grant contents write permission for release creation

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

Author: tylergibbs1

.github/workflows/ci.yml

@@ -4,6 +4,9 @@ on:
   push:
     branches: [main]
 
+permissions:
+  contents: write
+
 jobs:
   ci:
     runs-on: ubuntu-latest