fix: add missing permissions to GitHub Actions workflows

- Add issues, pull-requests, and checks write permissions to test.yml
- Add statuses write permission to benchmark-pr.yml
- Fixes "Resource not accessible by integration" errors in CI/CD

These permissions allow workflows to create PR comments and commit statuses.

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

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

.github/workflows/test.yml

@@ -5,6 +5,12 @@ on:
   pull_request:
     branches: [main]
 
+permissions:
+  contents: read
+  issues: write
+  pull-requests: write
+  checks: write
+
 jobs:
   test:
     runs-on: ubuntu-latest