feat: update claude.yml example to use write permissions

Changed permissions in examples/claude.yml from read to write for:
- contents: read → write
- pull-requests: read → write
- issues: read → write

This allows the Claude Code Action to perform write operations on these resources.

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

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

examples/claude.yml

@@ -19,9 +19,9 @@ jobs:
       (github.event_name == 'issues' && contains(github.event.issue.body, '@claude'))
     runs-on: ubuntu-latest
     permissions:
-      contents: read
-      pull-requests: read
-      issues: read
+      contents: write
+      pull-requests: write
+      issues: write
       id-token: write
     steps:
       - name: Checkout repository