feat(battle-engine): M1 auto-copy closure (782 battle-logic files)

Compile-driven bulk-copy loop (tools/engine-port/m1_copy_loop.py) pulled the precise reference closure of the battle-core roots, stopping at the classify god-object/View-VFX-UI boundary. 782 files; no re-explosion (M0 had estimated ~order 1000). Residual frontier = 52 shim-classified + 80 external (Unity/BCL) types to author next.

SVSim.BattleEngine/Engine/FusionIngredientInfo.cs

@@ -0,0 +1,17 @@
+public class FusionIngredientInfo
+{
+	public readonly int FusionTurn;
+
+	public readonly BattleCardBase Card;
+
+	public FusionIngredientInfo(int turn, BattleCardBase card)
+	{
+		FusionTurn = turn;
+		Card = card;
+	}
+
+	public FusionIngredientInfo Clone()
+	{
+		return new FusionIngredientInfo(FusionTurn, Card);
+	}
+}