Add permissions for contents, issues, and pull-requests

Author: hkv-31

.github/workflows/agent.yml

@@ -6,6 +6,11 @@ on:
   pull_request_review_comment:
     types: [created]
 
+permissions:
+  contents: read
+  issues: write
+  pull-requests: write
+
 jobs:
   run-agent:
     if: |