Update source sidecar upload status after remediation failure

BSEBENCH_SOURCE.json

@@ -59,6 +59,7 @@
   },
   "upload_status": {
     "status": "partial_uploaded",
+    "updated_at_utc": "2026-05-08T11:05:34Z",
     "uploaded_files": [
       "README.md",
       "BSEBENCH_SOURCE.json",
@@ -70,6 +71,6 @@
     "not_uploaded_files": [
       "TimeSeriesData.zip"
     ],
-    "blocker": "Hugging Face private repository storage limit reached while uploading TimeSeriesData.zip."
+    "blocker": "TimeSeriesData.zip upload still failed after repo was made public because two local HfApi.upload_file attempts were killed with exit code 137 before a Hugging Face commit completed."
   }
 }