feat(battle-engine): re-establish dropped base clauses for net-new stubs (2704->2202 true)

The stub generator emits net-new types as base-LESS partials, so generated Vfx/View
types weren't actually VfxBase/etc. -> hundreds of CS1503/CS0029 'cannot convert to
VfxBase' at every polymorphic call site. m1_baseclauses.py recovers each generated
type's decomp base CLASS (interfaces dropped to avoid CS0535) into _BaseClauses.g.cs,
cross-namespace bases fully qualified. Generated the intermediate Vfx/processing base
types (SpreadOutVfx/OpenCardVfx/ProcessingBase/DamageVfxBase/ForecastIconVfxBase/...).
DefaultOpeningVfx regenerated WITH override (its base OpeningVfx is copied+abstract).

Clearing the polymorphism cascade + the masking base-type CS0246s unmasked the true
member-level frontier: 2202 (CS1501/CS1061/CS1503), 0 structural errors.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

SVSim.BattleEngine/Engine/Wizard.Battle.Player.ClassCharacter/Player3dClassCharacter.cs

@@ -0,0 +1,82 @@
+using UnityEngine;
+
+namespace Wizard.Battle.Player.ClassCharacter;
+
+public class Player3dClassCharacter : Class3dCharacterBase
+{
+	private readonly float ScreenWidthFraction = 0.5f;
+
+	private readonly float ScreenHeightFraction = 0.05f;
+
+	private readonly Vector3 WIDGET_POSITION = new Vector3(0f, -460f, 30f);
+
+	private readonly int WIDGET_OFFSET_BOTTOM = 71;
+
+	private readonly int WIDGET_OFFSET_TOP = 171;
+
+	protected override Vector3 MessagePosition => UIManager.GetInstance().getCamera().ScreenToWorldPoint(new Vector3((float)Screen.width * ScreenWidthFraction, (float)Screen.height * ScreenHeightFraction, 0f));
+
+	public Player3dClassCharacter(int classId)
+	{
+		_classCharacterId = classId;
+		IsPlayer = true;
+	}
+
+	public void SetClassId(int id)
+	{
+		_classCharacterId = id;
+	}
+
+	protected override string GetTagName()
+	{
+		return "Player";
+	}
+
+	protected override Quaternion ConvertBackPanelRotation(Quaternion originalRotation)
+	{
+		return originalRotation;
+	}
+
+	protected override Vector3 GetPosition()
+	{
+		return Global.CLASS_BATTLE_POSITION_PLAYER;
+	}
+
+	protected override void SetUpAnchor(GameObject o)
+	{
+		o.transform.localPosition = WIDGET_POSITION;
+		UIWidget uIWidget = o.AddComponent<UIWidget>();
+		uIWidget.bottomAnchor.relative = 0f;
+		uIWidget.bottomAnchor.absolute = WIDGET_OFFSET_BOTTOM;
+		Transform transform = BattleManagerBase.GetIns().Battle3DContainer.transform;
+		uIWidget.bottomAnchor.target = transform;
+		uIWidget.topAnchor.target = transform;
+		uIWidget.topAnchor.relative = 0f;
+		uIWidget.topAnchor.absolute = WIDGET_OFFSET_TOP;
+	}
+
+	protected override void AttachOtherUI(GameObject o)
+	{
+		BattleManagerBase.GetIns().BattlePlayer.BattleView.EpPanel.transform.parent = o.transform;
+	}
+
+	public override Vector3 GetMaskImagePosition()
+	{
+		return new Vector3(0f, 0.12f, 0f);
+	}
+
+	protected override Vector3 GetShieldPosition()
+	{
+		return new Vector3(2f, 1.7f, 0f);
+	}
+
+	protected override Vector3 GetLifeIconPosition()
+	{
+		return new Vector3(0f, 0f, 0.1f);
+	}
+
+	public override Quaternion GetMaskImageRotation()
+	{
+		return Quaternion.identity;
+	}
+}