Improve README update process to handle push race conditions

.github/workflows/main-validation-readme.yml

@@ -484,7 +484,22 @@ jobs:
           git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
           git add README.md docs/README-details.md
           git commit -m "chore: refresh generated README from main validation [skip ci]"
-          git push
+
+          # Avoid push races when multiple runs update main close together.
+          for attempt in 1 2 3; do
+            echo "Push attempt $attempt"
+            git fetch origin main
+            git rebase origin/main
+            if git push origin HEAD:main; then
+              echo "Push succeeded."
+              exit 0
+            fi
+            echo "Push failed due to remote updates, retrying..."
+            sleep 3
+          done
+
+          echo "Failed to push README update after retries."
+          exit 1
 
       - name: Upload validation artifacts
         if: always()