Add V2 release README

v2/README_v2_release.md

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+# V2 Release (Polymarket Trading-Layer, pre80m)
+
+This V2 release contains the finalized trading-layer tables used for modeling.
+
+## Files
+
+1. `v2/v2_behavior_features_merged_pospnl_kline_v1.parquet`
+   - Final modeling table (behavior + position/pnl features + 12h/2h Kline features).
+
+2. `v2/v2_behavior_main_pre80m_normal_final_cap30_pricecovered.parquet`
+   - Final behavior base table after filtering (normal users, cap30, price-covered markets).
+
+3. `v2/v2_market_semantic_from_behavior_cap30_pricecovered.parquet`
+   - Market semantic lookup aligned with the final behavior table.
+
+4. `v2/v2_trade_price_matched_pre80m_cap30.parquet`
+   - Matched trade-price table restricted to the final market universe.
+
+## Scope
+
+- Time cutoff: pre80m
+- User-market cap: 30
+- Markets included: only price-covered markets