Accept hash sidecars in leakage audit

workspace/scripts/audit_cil_charts.py

@@ -130,12 +130,16 @@ def _audit_run_hashes(run_root: Path, warnings: list[str]) -> None:
         except json.JSONDecodeError:
             warnings.append(f"{path}: invalid JSON; skipped hash audit")
             continue
-        if "data_hash" not in payload:
+        if "data_hash" not in payload and not _sidecar_has_content(path.parent / "data_hash.txt"):
             warnings.append(f"{path}: missing data_hash")
-        if "split_hash" not in payload:
+        if "split_hash" not in payload and not _sidecar_has_content(path.parent / "split_hash.txt"):
             warnings.append(f"{path}: missing split_hash")
 
 
+def _sidecar_has_content(path: Path) -> bool:
+    return path.exists() and bool(path.read_text().strip())
+
+
 def _markdown(report: dict[str, Any]) -> str:
     lines = [
         "# CIL Chart Leakage Audit",