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/DamageInfo.cs

@@ -0,0 +1,44 @@
+public class DamageInfo
+{
+	public const string DAMAGE_BATTLE = "battle";
+
+	public const string DAMAGE_UNIT = "unit";
+
+	public const string DAMAGE_SPELL = "spell";
+
+	public const string DAMAGE_FIELD = "field";
+
+	public SkillBase Skill { get; private set; }
+
+	public int Damage { get; private set; }
+
+	public string DamageKind
+	{
+		get
+		{
+			if (Skill == null)
+			{
+				return "battle";
+			}
+			if (Skill.SkillPrm.ownerCard.IsUnit)
+			{
+				return "unit";
+			}
+			if (Skill.SkillPrm.ownerCard.IsSpell)
+			{
+				return "spell";
+			}
+			if (Skill.SkillPrm.ownerCard.IsField)
+			{
+				return "field";
+			}
+			return "";
+		}
+	}
+
+	public DamageInfo(SkillBase skill, int damage)
+	{
+		Skill = skill;
+		Damage = damage;
+	}
+}