Add split background promotion workflow

backend/tests/test_sprint159_split_promotion_workflow.py

@@ -0,0 +1,29 @@
+from __future__ import annotations
+
+from pathlib import Path
+
+
+ROOT = Path(__file__).resolve().parents[2]
+
+
+def test_split_background_promotion_workflow_runs_split_then_split_aware_report() -> None:
+    script_path = ROOT / "scripts" / "run_split_background_promotion_workflow.sh"
+    assert script_path.exists()
+    source = script_path.read_text(encoding="utf-8")
+
+    assert "run_background_corpus_split_matrix.sh" in source
+    assert "build_detection_model_promotion_report.py" in source
+    assert "--background-split-summary" in source
+    assert "background_corpus_split_summary.json" in source
+    assert "PROMOTION_POSITIVE_PORTFOLIO_PATH" in source
+    assert "BACKGROUND_SPLIT_OUTPUT_DIR" in source
+    assert "PROMOTION_OUTPUT_DIR" in source
+    assert "--hard-negative-summary" not in source
+    assert "download model" not in source.lower()
+    assert "promote model default" not in source.lower()
+
+
+def test_readiness_checks_split_background_promotion_workflow_syntax() -> None:
+    readiness = (ROOT / "scripts" / "run_readiness_check.sh").read_text(encoding="utf-8")
+
+    assert "bash -n scripts/run_split_background_promotion_workflow.sh" in readiness