Add split promotion preflight

backend/tests/test_sprint159_split_promotion_workflow.py

@@ -23,6 +23,18 @@ def test_split_background_promotion_workflow_runs_split_then_split_aware_report(
     assert "promote model default" not in source.lower()
 
 
+def test_split_background_promotion_workflow_has_safe_preflight_mode() -> None:
+    source = (ROOT / "scripts" / "run_split_background_promotion_workflow.sh").read_text(encoding="utf-8")
+
+    assert "--preflight-only" in source
+    assert "PREFLIGHT_ONLY" in source
+    assert "curl -fsS" in source
+    assert "OPERATOR_SAMPLE_MANIFEST_PATH is required" in source
+    assert "pure_empty_negative" in source
+    assert "sparse_building_context" in source
+    assert "Split-background promotion preflight passed" in source
+
+
 def test_readiness_checks_split_background_promotion_workflow_syntax() -> None:
     readiness = (ROOT / "scripts" / "run_readiness_check.sh").read_text(encoding="utf-8")