refactor(runtime): own combat and magic intent

Move attack build/repeat state, combat-mode policy, authoritative auto-target transitions, and spell-cast intent beneath RuntimeActionState. Keep App as the input, world-query, DAT-policy, transport, and presentation adapter while preserving retail request and busy ordering. Add direct/graphical parity, reset, failure, and instance-isolation coverage.

Co-authored-by: Codex <noreply@openai.com>

tests/AcDream.Runtime.Tests/Gameplay/RuntimeActionTestFactory.cs

@@ -0,0 +1,64 @@
+using AcDream.Core.Combat;
+using AcDream.Core.Items;
+using AcDream.Core.Spells;
+using AcDream.Runtime.Gameplay;
+
+namespace AcDream.Runtime.Tests.Gameplay;
+
+internal static class RuntimeActionTestFactory
+{
+    public static RuntimeActionState Create(
+        InventoryTransactionState inventory,
+        Func<double>? now = null) =>
+        new(
+            inventory,
+            new Spellbook(),
+            new CombatOperations(),
+            new CombatTargetOperations(),
+            new CombatModeOperations(),
+            new SpellOperations(),
+            now);
+
+    private sealed class CombatOperations : IRuntimeCombatAttackOperations
+    {
+        public bool CanStartAttack() => false;
+        public void PrepareAttackRequest() { }
+        public bool SendAttack(AttackHeight height, float power) => false;
+        public void SendCancelAttack() { }
+        public bool IsDualWield => false;
+        public bool PlayerReadyForAttack => false;
+        public bool AutoRepeatAttack => false;
+    }
+
+    private sealed class CombatTargetOperations
+        : IRuntimeCombatTargetOperations
+    {
+        public bool AutoTarget => false;
+        public uint? SelectClosestTarget() => null;
+    }
+
+    private sealed class CombatModeOperations
+        : IRuntimeCombatModeOperations
+    {
+        public bool IsInWorld => false;
+        public IReadOnlyList<ClientObject> GetOrderedEquipment() => [];
+        public void NotifyExplicitCombatModeRequest() { }
+        public void SendChangeCombatMode(CombatMode mode) { }
+    }
+
+    private sealed class SpellOperations : IRuntimeSpellCastOperations
+    {
+        public uint LocalPlayerId => 0u;
+        public bool CanSend => false;
+        public bool HasRequiredComponents(uint spellId) => false;
+        public bool IsTargetCompatible(
+            uint targetId,
+            SpellMetadata spell,
+            bool showMessage) => false;
+        public void StopCompletely() { }
+        public void SendUntargeted(uint spellId) { }
+        public void SendTargeted(uint targetId, uint spellId) { }
+        public void DisplayMessage(string message) { }
+        public void IncrementBusy() { }
+    }
+}