fix: sleep 5 at teardown violates AGENTS.md engineering principles (#845)

scripts/harb-evaluator/red-team-sweep.sh

@@ -261,9 +261,16 @@ PYEOF
     '{completed: $arr, last_updated: now | todate}' > "$PROGRESS_FILE"
   log "DONE $seed_name"
 
-  # 6. Teardown
+  # 6. Teardown — poll until all containers have exited (no fixed sleep)
   cd "$REPO_ROOT" && docker compose down -v 2>/dev/null || true
-  sleep 5
+  _deadline=$(( $(date +%s) + 30 ))
+  while [[ -n "$(docker compose ps --quiet 2>/dev/null)" ]]; do
+    if [[ $(date +%s) -ge $_deadline ]]; then
+      log "WARNING: containers still present after 30s — proceeding anyway"
+      break
+    fi
+    sleep 1
+  done
 done
 
 # Restore original