Belief/Trade reorg: add unified metadata folder for Trade

Trade/metadata/support_set_metadata.json

@@ -0,0 +1,15 @@
+{
+  "version": "support_set_v2_excl2000",
+  "source_table": "/fsx/home/liangwei.yang/.openclaw/workspace/projects/usermodeling-dataset/v2/v2_behavior_features_merged_pospnl_kline_v2_fixcost.parquet",
+  "excluded_wallets_file": "/fsx/home/liangwei.yang/.openclaw/workspace/projects/usermodeling-dataset/v2_outputs/wallet_ids_v2_2000_by_tx.txt",
+  "rule": "support set includes all wallets except fixed 2000 experiment wallets; sorted by wallet, block, log_index",
+  "outputs": {
+    "support_wallet_trades": "/fsx/home/liangwei.yang/.openclaw/workspace/projects/usermodeling-dataset/v2_outputs/support_set_v2_excl2000/support_wallet_trades.parquet",
+    "support_wallet_index": "/fsx/home/liangwei.yang/.openclaw/workspace/projects/usermodeling-dataset/v2_outputs/support_set_v2_excl2000/support_wallet_index.parquet"
+  },
+  "stats": {
+    "support_rows": 5086400,
+    "support_wallets": 11676,
+    "index_wallets": 11676
+  }
+}