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/Composition/SessionPlayerComposition.cs

@@ -85,8 +85,7 @@ internal sealed record SessionPlayerDependencies(
     CombatState Combat,
     CombatFeedbackSlot CombatFeedback,
     RuntimeCommunicationState Communication,
-    LocalPlayerState LocalPlayer,
-    Spellbook Spellbook,
+    RuntimeCharacterState Character,
     TransferableResourceSlot<PortalTunnelPresentation> PortalTunnelFallback,
     Action<string> Log);
 
@@ -802,8 +801,7 @@ internal sealed class SessionPlayerCompositionPhase
                 d.CharacterOptions),
             new LiveSessionDomainRuntime(
                 d.EntityObjects,
-                d.LocalPlayer,
-                d.Spellbook,
+                d.Character,
                 d.Combat,
                 d.Inventory,
                 d.Communication),