Add stronger log write and payload error handling

Agent-Logs-Url: https://github.com/th30d4y/OpenLearnX/sessions/17fba2c8-4f49-4a78-9dc4-483acc8cc945

Co-authored-by: Stalin-143 <161853795+Stalin-143@users.noreply.github.com>

.github/workflows/mirror-repo-events-to-logs.yml

@@ -60,7 +60,7 @@ jobs:
           LOG_FILE="$LOG_DIR/events.jsonl"
 
           if [ ! -r "$GITHUB_EVENT_PATH" ]; then
-            echo "GitHub event payload file is missing or unreadable: $GITHUB_EVENT_PATH"
+            echo "GitHub event payload file is missing or unreadable: $GITHUB_EVENT_PATH. Check workflow run environment details."
             exit 1
           fi
 
@@ -92,6 +92,11 @@ jobs:
               payload: $payload[0]
             }' >> "$LOG_FILE"
 
+          if [ ! -s "$LOG_FILE" ]; then
+            echo "Log write failed: $LOG_FILE was not created with content."
+            exit 1
+          fi
+
       - name: Commit and push logs
         run: |
           set -euo pipefail