Phase 9 Session 2 — HGT retraining on 140-ticker graph + GNN drift factor null result#8

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feature/phase9-session2

May 17, 2026

Commits on May 17, 2026

feat(phase9): retrain HGT on 140-ticker graph — val AUC 0.9807, model_version hgt_link_pred_v2
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feat(phase9): backfill node_embeddings 140 tickers × 58 snapshots under hgt_link_pred_v2
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research(phase9): graph_gnn_embedding_drift IC backtest — null at all horizons (t<1), not registered
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feat(phase9): register graph_gnn_embedding_drift as rejected in signal_registry
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docs(phase9): session 2 complete — HGT retrain + GNN drift factor definitively null
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