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>

src/AcDream.App/Rendering/GameWindow.cs

@@ -337,14 +337,14 @@ public sealed class GameWindow :
     public readonly AcDream.Core.Combat.CombatState Combat = new();
     private readonly RuntimeEntityObjectLifetime _runtimeEntityObjects = new();
     private readonly RuntimeInventoryState _runtimeInventory;
+    private readonly RuntimeCharacterState _runtimeCharacter;
     public AcDream.Core.Items.ItemManaState ItemMana =>
         _runtimeInventory.ItemMana;
-    public IReadOnlyList<(uint Id, uint Amount)> DesiredComponents =>
-        _runtimeInventory.DesiredComponents.Items;
     // Retail resolves learned IDs through portal.dat's CSpellTable. MagicCatalog
     // installs that immutable table once DatCollection opens in OnLoad.
     public AcDream.Core.Spells.SpellTable SpellTable => SpellBook.Metadata;
-    public readonly AcDream.Core.Spells.Spellbook SpellBook = null!;
+    public AcDream.Core.Spells.Spellbook SpellBook =>
+        _runtimeCharacter.Spellbook;
     /// <summary>Persisted hotbar shortcuts from the last PlayerDescription (D.5.1 toolbar source).</summary>
     public IReadOnlyList<AcDream.Core.Items.ShortcutEntry> Shortcuts =>
         _runtimeInventory.Shortcuts.Items;
@@ -352,7 +352,8 @@ public sealed class GameWindow :
     // PlayerDescription so the Vitals HUD can render those bars.
     // Issue #6 — wired to SpellBook so GetMaxApprox folds enchantment
     // buffs into the max formula via Spellbook.GetVitalMod.
-    public readonly AcDream.Core.Player.LocalPlayerState LocalPlayer = null!;
+    public AcDream.Core.Player.LocalPlayerState LocalPlayer =>
+        _runtimeCharacter.LocalPlayer;
 
     // Phase D.2a — ImGui devtools UI overlay. Null unless ACDREAM_DEVTOOLS=1.
     // See docs/plans/2026-04-24-ui-framework.md for the staged UI strategy.
@@ -562,6 +563,7 @@ public sealed class GameWindow :
     {
         _options = options ?? throw new System.ArgumentNullException(nameof(options));
         _runtimeInventory = new RuntimeInventoryState(_runtimeEntityObjects);
+        _runtimeCharacter = new RuntimeCharacterState();
         var alphaScratchBudgets =
             AcDream.App.Rendering.Residency.AlphaScratchBudgetProfile.Create(
                 _options.ResidencyBudgets.AlphaScratchBytes);
@@ -591,8 +593,6 @@ public sealed class GameWindow :
         _uiRegistry = uiRegistry;
         _animatedEntities = new LiveEntityAnimationRuntimeView<LiveEntityAnimationState>(
             _liveEntityRuntimeSlot);
-        SpellBook = new AcDream.Core.Spells.Spellbook();
-        LocalPlayer = new AcDream.Core.Player.LocalPlayerState(SpellBook);
         // #184 Slice 2a: the extracted per-remote DR tick. Its stateful
         // setup/motion dependency crosses the fail-fast construction bridge;
         // the server-velocity animation cycle is stateless shared policy.
@@ -1149,7 +1149,7 @@ public sealed class GameWindow :
                     _options.ResidencyBudgets,
                     _physicsDataCache,
                     _animationDiagnostics.DumpMotionEnabled,
-                    SpellBook,
+                    _runtimeCharacter,
                     _hookRouter,
                     _effectPoses,
                     _entityEffectAdvance,
@@ -1261,9 +1261,8 @@ public sealed class GameWindow :
                     _selection,
                     _runtimeInventory,
                     contentEffectsAudio.MagicCatalog,
-                    SpellBook,
+                    _runtimeCharacter,
                     _runtimeCommunication,
-                    LocalPlayer,
                     _stackSplitQuantity,
                     _uiRegistry,
                     _liveCombatModeCommands,
@@ -1405,8 +1404,7 @@ public sealed class GameWindow :
                     Combat,
                     _combatFeedback,
                     _runtimeCommunication,
-                    LocalPlayer,
-                    SpellBook,
+                    _runtimeCharacter,
                     _portalTunnelFallback,
                     Console.WriteLine),
                 this).Compose(
@@ -1582,6 +1580,7 @@ public sealed class GameWindow :
             _liveEntities,
             _runtimeEntityObjects,
             _runtimeInventory,
+            _runtimeCharacter,
             _runtimeCommunication,
             _renderSceneShadow,
             _livePresentationBindings,

src/AcDream.App/Rendering/GameWindowLifetime.cs

@@ -85,6 +85,7 @@ internal sealed record LiveShutdownRoots(
     LiveEntityRuntime? LiveEntities,
     RuntimeEntityObjectLifetime EntityObjects,
     RuntimeInventoryState Inventory,
+    RuntimeCharacterState Character,
     RuntimeCommunicationState Communication,
     RenderSceneShadowRuntime? RenderSceneShadow,
     LivePresentationRuntimeBindings? PresentationBindings,
@@ -391,6 +392,9 @@ internal static class GameWindowShutdownManifest
             ]),
             new ResourceShutdownStage("runtime entity/object stream",
             [
+                Hard(
+                    "runtime character state",
+                    live.Character.Dispose),
                 Hard(
                     "runtime inventory state",
                     live.Inventory.Dispose),