refactor(app): key live projections by runtime identity

Move materialized live-object sidecars and presentation worksets to exact RuntimeEntityKey ownership. Runtime remains the only GUID/incarnation/local-ID authority while hydration, animation, effects, lights, equipped children, renderer resources, visibility, liveness, and teardown resolve exact projection identities. Preserve synchronous callbacks, local-ID allocation order, and current rendering behavior.

src/AcDream.App/Composition/SessionPlayerComposition.cs

@@ -335,6 +335,11 @@ internal sealed class SessionPlayerCompositionPhase
             live.WorldAvailability,
             d.Selection,
             live.WorldState,
+            guid => live.LiveEntities.TryGetLocalEntityId(
+                guid,
+                out uint localEntityId)
+                    ? localEntityId
+                    : null,
             content.Audio?.Engine);
         var compositeWarmupSource =
             new CompositeWarmupEntitySource(live.WorldState);