contentsをwriteに

.github/workflows/claude.yml

···
       (github.event_name == 'issues' && (contains(github.event.issue.body, '@claude') || contains(github.event.issue.title, '@claude')))
     runs-on: ubuntu-latest
     permissions:
-      contents: read
+      contents: write
       pull-requests: read
       issues: read
       id-token: write