Enhance stale PR workflow with debug logging

Added logging for GitHub context and event name.

.github/workflows/stale_pr_close.yml

@@ -17,6 +17,10 @@ jobs:
         uses: actions/github-script@v7
         with:
           script: |
+            console.log('github object:', typeof github);
+            console.log('github.rest:', typeof github?.rest);
+            console.log('context.eventName:', context.eventName);
+            
             const now = new Date();
             const owner = context.repo.owner;
             const repo = context.repo.repo;