checkpoint(render): G2 owner findings — terrain punch assigned to S4, portal-haze probe

Owner G2 check at 4b0b29e4: Facility Hub PASS, Holtburg house PASS,
cathedral leak unchanged (S3/S4). Two new findings:
- doorway-sized fragments of houses on the terrace below show through
  the hill in Holtburg: PortalDepthMaskRenderer draws every visited cell's
  exit-portal fan with depth compare Always + write, so a doorway behind
  terrain still punches far depth through it. Pre-existing; S4 owns the
  punch (ledger row updated).
- the purple UnHide haze (script type 0x75, played on the retail
  Hidden->visible physics-state edge) no longer shows on the local player
  after a portal. Under investigation: temporary print-only traces
  [pes-spawn]/[pes-vis] under ACDREAM_DUMP_PLAYSCRIPT=1 (launch-options row
  amended; both die with the investigation) and a timed arrival route
  tools/overhaul-selfgate/route-portal-haze.txt.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

src/AcDream.App/Composition/ContentEffectsAudioComposition.cs

@@ -470,6 +470,10 @@ internal sealed class ContentEffectsAudioCompositionPhase :
             Fault(ContentEffectsAudioCompositionPoint.EmitterRegistryPublished);
 
             ParticleSystem particles = _factory.CreateParticleSystem(emitters);
+            // TEMPORARY (2026-09-03 portal-haze investigation): the system's
+            // own trace is gated inside on ACDREAM_DUMP_PLAYSCRIPT=1.
+            particles.DiagnosticSink = message =>
+                _dependencies.Error($"vfx: {message}");
             _publication.PublishParticleSystem(particles);
             Fault(ContentEffectsAudioCompositionPoint.ParticleSystemPublished);