100K embedding: supervisor achieves 67.6/sec (57% faster than single pipeline)

- 4 parallel pipelines on i9 + A4000 via Ollama
- Previous single-pipeline: 43/sec, 39min for 100K
- Supervisor: 67.6/sec, 22min for 100K
- Previous 100K attempt failed at 97K (no retry) — supervisor handles this
- Checkpointing every 1000 chunks for crash recovery
- Round-robin retry on batch failure (3 attempts)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

data/_catalog/manifests/0fd78303-9ad4-45fd-90d7-db95607d9ab1.json

@@ -0,0 +1,23 @@
+{
+  "id": "0fd78303-9ad4-45fd-90d7-db95607d9ab1",
+  "name": "timesheets",
+  "schema_fingerprint": "auto",
+  "objects": [
+    {
+      "bucket": "data",
+      "key": "datasets/timesheets.parquet",
+      "size_bytes": 17539932,
+      "created_at": "2026-03-27T14:42:43.922019299Z"
+    }
+  ],
+  "created_at": "2026-03-27T14:42:43.922025703Z",
+  "updated_at": "2026-03-27T14:42:43.922025703Z",
+  "description": "",
+  "owner": "",
+  "sensitivity": null,
+  "columns": [],
+  "lineage": null,
+  "freshness": null,
+  "tags": [],
+  "row_count": null
+}