fix(dataset): exclude sponsor references from public rows

data/items.jsonl

@@ -1,6 +1,3 @@
-{"id":"467896b5-43d3-499f-ad8e-01117df93716","kind":"sponsor_example","filename":"execution_trace_drafts-1.json","contentType":"application/json","checksumSha256":"10bbb426d6af9f5046e63f0315bd1d902b9603741973d66d1d827a3e71c4c39e"}
-{"id":"19c2e7a7-a5dc-4fad-abea-feead6531b39","kind":"sponsor_example","filename":"execution_trace_drafts-2.json","contentType":"application/json","checksumSha256":"6879890a763756fcec73d54666ea8b15ec9cede5bb01d45418af5437c70c5984"}
-{"id":"ca00bb89-d1c2-41f1-bef8-78dfa1e441ec","kind":"sponsor_example","filename":"execution_trace_drafts-3.json","contentType":"application/json","checksumSha256":"2c6608160b303c2af34a30dd4eb95ec12f25924b7dd2e27b030a65e28949fa25"}
 {"id":"cmskf3c8200071wp2lcgno27p","kind":"contributor_item","title":"Submission GNO27P","provisional":false,"code":"def demo():\n    config = {\"retries\": 3}\n    kept = config.setdefault(\"retries\", 10)\n    added = config.setdefault(\"timeout\", 30)\n    return (kept, added, config.get(\"timeout\", 99), sorted(config.items()))","input":"demo()","language":"Python","predicted_output":"(3, 30, 30, [('retries', 3), ('timeout', 30)])"}
 {"id":"cmskf3c8200051wp25947eul8","kind":"contributor_item","title":"Submission 47EUL8","provisional":false,"code":"def demo():\n    loose = []\n    for factor in range(1, 4):\n        loose.append(lambda x: x * factor)\n    bound = [lambda x, factor=factor: x * factor for factor in range(1, 4)]\n    return ([f(10) for f in loose], [f(10) for f in bound])","input":"demo()","language":"Python","predicted_output":"([30, 30, 30], [10, 20, 30])"}
 {"id":"cmskf3c8300091wp29wn8ecs7","kind":"contributor_item","title":"Submission N8ECS7","provisional":false,"code":"def demo():\n    path = \"a/b/c/d\"\n    parts = path.split(\"/\")\n    return (parts[::-1], \"/\".join(parts[1:-1]), path.partition(\"/\"), path[::2])","input":"demo()","language":"Python","predicted_output":"(['d', 'c', 'b', 'a'], 'b/c', ('a', '/', 'b/c/d'), 'abcd')"}

manifest.json

@@ -1,7 +1,7 @@
 {
   "bountyId": "cmskdimpn00751wp25c42ab1p",
   "generatedAt": "2026-08-19T07:38:47.942Z",
-  "acceptedItems": 1003,
+  "acceptedItems": 1000,
   "sponsorExamples": [
     {
       "id": "467896b5-43d3-499f-ad8e-01117df93716",
@@ -7160,4 +7160,4 @@
     "resaleEligible": false,
     "resaleRoyalty": "50% pro-rata to contributors"
   }
-}
+}