#121: dynamics-owner particle pass - world portals visible again; re-gate ledger in ISSUES

Fix: dynamics' ATTACHED emitters (portal swirls on server-spawned portal
entities, creature effects) fell through EVERY particle filter under the
unified pview path - the landscape slice filter carries outdoor statics
(+ the #118 outside-stage dynamics), the per-cell callback carries cell
statics, and T4 deleted the clipRoot==null global pass from normal
frames. T5 never checked portals; the user's re-gate caught it ("all
portals that were previously showing are now gone"). DrawDynamicsLast
now hands its cone-surviving dynamics (minus outside-stage entities,
whose emitters already drew in the landscape slice - alpha particles
must not double-draw) to a new DrawDynamicsParticles callback;
GameWindow draws Scene-pass emitters filtered to those owner ids,
mirroring DrawRetailPViewCellParticles. Retail shape: emitters draw
with their owner object.

Re-gate ledger (user verdicts are axioms):
- #117 CLOSED ("Yes solved"), #118 CLOSED ("Yes solved" + NPC-through-
  door "Yes fixed").
- #108 REOPENED narrowed: cellar-ascent eye-below-grade window only
  (grass covers the exit door until the head pops over ground level);
  fix belongs on the membership/viewer side - the depth-gated punch
  stays (DO-NOT-RETRY).
- #119 user split: phantom walkable stairs at the hill cottage (#113
  family), tower missing stairs + barrel (#119 proper), hill-house
  transparent-on-entry (#112 - re-check after the #120 fix; the
  ping-pong fired at exactly A9B3 0103/010F).
- #120 FIXED pending re-gate (dede7e4).
- NEW #122 window oscillation on entry (re-check after #120 first),
  NEW #123 buildings transiently disappear running close past,
  NEW #124 far-building back walls missing through openings (lead:
  per-building look-in floods run only for outdoor roots -
  NearbyBuildingCells is null for interior roots; retail runs the
  look-in inside LScape::draw for ANY root).

Suites: App 236, Core 1419+2skip, UI 420, Net 294.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/AcDream.App/Rendering/GameWindow.cs

@@ -7729,6 +7729,8 @@ public sealed class GameWindow : IDisposable
                             forceFarZ: clipRoot.IsOutdoorNode),
                     DrawCellParticles = sliceCtx =>
                         DrawRetailPViewCellParticles(sliceCtx, camera, camPos),
+                    DrawDynamicsParticles = survivors =>
+                        DrawRetailPViewDynamicsParticles(survivors, camera, camPos),
                     EmitDiagnostics = result =>
                         EmitRetailPViewDiagnostics(
                             result,
@@ -9630,6 +9632,43 @@ public sealed class GameWindow : IDisposable
         DisableClipDistances();
     }
 
+    // #121: the dynamics-owner particle pass — Scene-pass emitters attached to
+    // the frame's cone-surviving dynamics (portal swirls on server-spawned
+    // portal entities, creature effects). Retail draws emitters with their
+    // owner object; before this pass, dynamics' emitters fell through every
+    // pview particle filter (landscape slice = outdoor statics + #118
+    // outside-stage dynamics; cell callback = cell statics) once T4 deleted
+    // the clipRoot==null global pass from normal frames — every world portal
+    // went invisible. Mirror of DrawRetailPViewCellParticles with the
+    // survivors' ids as the filter.
+    private readonly HashSet<uint> _dynamicsSceneParticleEntityIds = new();
+
+    private void DrawRetailPViewDynamicsParticles(
+        IReadOnlyList<AcDream.Core.World.WorldEntity> survivors,
+        ICamera camera,
+        System.Numerics.Vector3 camPos)
+    {
+        if (_particleSystem is null || _particleRenderer is null || survivors.Count == 0)
+            return;
+
+        _dynamicsSceneParticleEntityIds.Clear();
+        foreach (var entity in survivors)
+            _dynamicsSceneParticleEntityIds.Add(ParticleEntityKey(entity));
+
+        if (_dynamicsSceneParticleEntityIds.Count == 0)
+            return;
+
+        DisableClipDistances();
+        _particleRenderer.Draw(
+            _particleSystem,
+            camera,
+            camPos,
+            AcDream.Core.Vfx.ParticleRenderPass.Scene,
+            emitter => emitter.AttachedObjectId != 0
+                       && _dynamicsSceneParticleEntityIds.Contains(emitter.AttachedObjectId));
+        DisableClipDistances();
+    }
+
     private void EmitRetailPViewDiagnostics(
         AcDream.App.Rendering.RetailPViewFrameResult result,
         LoadedCell clipRoot,