refactor(runtime): own magic and player state

Move the coupled Spellbook and LocalPlayerState into one Runtime-owned character graph, route content, live-session, retained UI, reset, and shutdown through that exact owner, and delete the duplicate desired-component snapshot from inventory state. Preserve synchronous retail update and reset ordering while adding independent-instance and retryable-failure coverage.

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

tests/AcDream.App.Tests/Composition/ContentEffectsAudioCompositionTests.cs

@@ -15,6 +15,7 @@ using AcDream.Core.Physics;
 using AcDream.Core.Rendering;
 using AcDream.Core.Spells;
 using AcDream.Core.Vfx;
+using AcDream.Runtime.Gameplay;
 using DatReaderWriter.DBObjs;
 using Silk.NET.Input;
 using Silk.NET.OpenAL;
@@ -257,7 +258,7 @@ public sealed class ContentEffectsAudioCompositionTests
                 ResidencyBudgetOptions.Default,
                 new PhysicsDataCache(),
                 false,
-                new Spellbook(),
+                new RuntimeCharacterState(),
                 Router,
                 Poses,
                 new DeferredEntityEffectAdvanceSource(),
@@ -289,7 +290,11 @@ public sealed class ContentEffectsAudioCompositionTests
                     throw new InvalidOperationException($"fault at {point}");
             });
 
-        public void Dispose() => Publication.Dispose();
+        public void Dispose()
+        {
+            Publication.Dispose();
+            Dependencies.Character.Dispose();
+        }
     }
 
     private sealed class Publication :
@@ -386,7 +391,9 @@ public sealed class ContentEffectsAudioCompositionTests
             return _preparedAssets;
         }
         public MagicCatalog LoadMagicCatalog(IDatReaderWriter dats) => _magic;
-        public void InstallSpellMetadata(Spellbook spellBook, MagicCatalog catalog) { }
+        public void InstallSpellMetadata(
+            RuntimeCharacterState character,
+            MagicCatalog catalog) { }
         public int GetSpellCount(MagicCatalog catalog) => 0;
         public IAnimationLoader CreateAnimationLoader(
             IDatReaderWriter dats,

tests/AcDream.App.Tests/Composition/InteractionRetainedUiCompositionTests.cs

@@ -191,9 +191,8 @@ public sealed class InteractionRetainedUiCompositionTests
                 Selection: null!,
                 Inventory: null!,
                 MagicCatalog: null!,
-                Spellbook: null!,
+                Character: null!,
                 Communication: null!,
-                LocalPlayer: null!,
                 StackSplitQuantity: null!,
                 UiRegistry: null,
                 CombatModeCommands: null!,