Align retrieval organization: keep support_set under dataset; benchmark/Belief/retrieval reserved for benchmark samples

benchmark/Belief/retrieval/README.md

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+# Belief Retrieval Benchmark
+
+This folder is reserved for Belief-level retrieval benchmark samples.
+
+Current status: benchmark samples are not released in canonical layout yet.
+Support set files live in `dataset/Belief/support_set/`.

benchmark/Belief/retrieval/benchmark_metadata.json

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+{
+  "benchmark": "Belief retrieval",
+  "status": "benchmark samples not released yet",
+  "note": "Support-set artifacts are organized under dataset/Belief/support_set. Trade retrieval benchmark samples are under benchmark/Trade/retrieval.",
+  "available_files": []
+}

benchmark/Belief/retrieval/support.parquet

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:f3ad580811af372aef2cb1e8590d3dbbb6e8bb2edcea6b6e46126afbb52fd0e2
-size 167961115

benchmark/Belief/retrieval/support_manifest.json

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-{
-  "support_version": "v1",
-  "source_file": "lyang84-UserModeling/cognition_wallet_market_labels_holdpos_noconf_mk10plus_time.parquet",
-  "experiment_wallets_excluded_file": "splits/wallet_ids_diverse_nonoverlap_2000_seed20260318.txt",
-  "construction": {
-    "wallet_scope": "all_wallets_minus_experiment_2000",
-    "label_filter": "stance_outcome and confidence must be non-null",
-    "dedup_key": [
-      "wallet",
-      "market_id",
-      "stance_first_block"
-    ],
-    "time_fields": [
-      "stance_first_block",
-      "stance_last_block"
-    ]
-  },
-  "counts": {
-    "experiment_wallets_excluded": 2000,
-    "support_wallets": 29319,
-    "support_rows": 1669164
-  },
-  "fields": [
-    "support_id",
-    "wallet",
-    "market_id",
-    "event_slug",
-    "question",
-    "stance_outcome",
-    "confidence",
-    "stance_first_block",
-    "stance_last_block",
-    "text_for_retrieval"
-  ]
-}