fix: ensure robust PROJECT_ROOT path resolution in all test_run_folder scripts

test_run_folder/test_run_hybrid.sh

@@ -15,7 +15,9 @@ if [ -f "$PROJECT_ROOT/venv/bin/python" ]; then
 else
     PYTHON="python3"
 fi
-dates=("$1")
+
+if [ $# -ge 1 ]; then
+    dates=("$1")
 else
     dates=(
         "2026-06-10" "2026-06-11" "2026-06-12" "2026-06-13" "2026-06-14"