Enhance world simulation and API functionality; implement clock management improvements, ensure proper handling of world states during updates, and refine data persistence methods to prevent resurrecting deleted worlds.

src/TheLivingWorld.Api/Simulation/WorldSimulation.cs

@@ -11,8 +11,6 @@ namespace TheLivingWorld.Api.Simulation;
 /// </summary>
 public sealed class WorldSimulation : IDisposable
 {
-    private static readonly ClockSystem ClockSystem = new();
-
     private readonly object _gate = new();
     private readonly World _ecs;
     private readonly Entity _clockEntity;
@@ -85,10 +83,11 @@ public sealed class WorldSimulation : IDisposable
 
             if (realElapsed > TimeSpan.Zero)
             {
-                var before = SnapshotClockUnlocked();
+                // Compare raw ticks: this runs at 10 Hz per world, so snapshotting DTOs just to diff would
+                // allocate for nothing.
+                var before = _ecs.Get<GameClock>(_clockEntity).Ticks;
                 ClockSystem.Execute(_ecs, realElapsed);
-                var after = SnapshotClockUnlocked();
-                if (after.GameTime != before.GameTime) _dirty = true;
+                if (_ecs.Get<GameClock>(_clockEntity).Ticks != before) _dirty = true;
             }
 
             _lastTickedAt = DateTimeOffset.UtcNow;