feat(vfx): bind effects to live animated poses

src/AcDream.Core/Vfx/VfxModel.cs

@@ -180,6 +180,15 @@ public sealed class ParticleEmitter
     public Vector3 AnchorPos { get; set; }
     public Quaternion AnchorRot { get; set; } = Quaternion.Identity;
     public uint AttachedObjectId { get; set; }
+    /// <summary>
+    /// Spatial presentation latch. A cell-less owner submits no particles.
+    /// </summary>
+    public bool PresentationVisible { get; set; } = true;
+    /// <summary>
+    /// Retail cell-membership update gate. Paused emitters retain their exact
+    /// particles, logical identity, and elapsed-time position until re-entry.
+    /// </summary>
+    public bool SimulationEnabled { get; set; } = true;
     public int AttachedPartIndex { get; set; } = -1;
     public Particle[] Particles { get; init; } = null!;
     public ParticleRenderPass RenderPass { get; init; }