fix: Add workflow permissions for issues and pull-requests

The GITHUB_TOKEN needs explicit permissions to:
- Read issues (for requirements review context)
- Write pull-requests (for posting review comments)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: sylvansys

.github/workflows/constellos-review.yml

@@ -6,6 +6,11 @@ on:
   pull_request:
     types: [opened, synchronize, reopened]
 
+permissions:
+  contents: read
+  issues: read
+  pull-requests: write
+
 jobs:
   # Read config and determine which agents to run
   config: