Add Belief dataset support set under dataset/Belief/support_set

dataset/Belief/support_set/support.parquet

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+version https://git-lfs.github.com/spec/v1
+oid sha256:f3ad580811af372aef2cb1e8590d3dbbb6e8bb2edcea6b6e46126afbb52fd0e2
+size 167961115

dataset/Belief/support_set/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"
+  ]
+}

dataset/Belief/support_set/support_spec.md

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+# support_set v1
+
+- Scope: all wallets excluding experiment 2000 wallets.
+- Label filter: keep rows with non-null `stance_outcome` and `confidence`.
+- Dedup key: `(wallet, market_id, stance_first_block)`.
+- Time fields kept: `stance_first_block`, `stance_last_block`.
+
+## Counts
+
+- experiment_wallets_excluded: 2000
+- support_wallets: 29319
+- support_rows: 1669164