Point dataset configs at parquet shards (fix JobManagerCrashedError)

README.md

@@ -23,15 +23,15 @@ configs:
 - config_name: default
   data_files:
   - split: train
-    path: blind/train.jsonl
+    path: parquet/blind/train/train-*.parquet
   - split: test
-    path: blind/test.jsonl
+    path: parquet/blind/test/test-*.parquet
 - config_name: ground_truth
   data_files:
   - split: train
-    path: ground_truth/train.jsonl
+    path: parquet/ground_truth/train/train-*.parquet
   - split: test
-    path: ground_truth/test.jsonl
+    path: parquet/ground_truth/test/test-*.parquet
 ---
 
 # Enron Correspondence Deduplicated (Enriched GT, Agent-Blind Default)
@@ -70,6 +70,16 @@ tipped off; humans can still audit every label in the viewer by switching to
 the `ground_truth` config. This is separation of concerns, NOT encryption —
 the Hub is public and any deliberate download can fetch both configs.
 
+## File layout
+
+Both configs point at pre-sharded **parquet** (`parquet/<config>/<split>/*.parquet`,
+zstd). The original `blind/*.jsonl` and `ground_truth/*.jsonl` files remain in
+the repo unchanged — row-for-row identical to the parquet shards (same order,
+same schema; verified 2026-08-23) — for pipelines that prefer line-delimited
+JSON. The single-file 548 MB `blind/train.jsonl` crashed the Dataset Viewer's
+conversion worker (`JobManagerCrashedError`); serving parquet directly removes
+that conversion step entirely.
+
 ## Ground-truth dimensions
 
 1. **doc_type / subclass** (`expected`, `expected_subclass`,