perf(vfx): port retail particle visibility degradation

Resolve DAT-authored particle ranges from the hardware GfxObj, apply retail distance and completed-cell visibility gates, and preserve the exact finite/infinite off-view update semantics. This removes dense-world simulation work without shortening terrain, entity, fog, or streaming distance.

Publish doorway-clipped outdoor cells through a focused frame controller, retain effect cell identity for outdoor statics, reject hidden emitters before particle-slot scans, and offer an explicit opt-in Extended particle range.

Release build succeeds and all 5,857 tests pass with five intentional skips. Retail-conformance, architecture, and adversarial review cycles are clean; connected Aerlinthe visual/performance gate pending.

Co-authored-by: OpenAI Codex <codex@openai.com>

tests/AcDream.Core.Tests/World/LandblockLoaderTests.cs

@@ -147,6 +147,29 @@ public class LandblockLoaderTests
         Assert.All(idsB, id => Assert.Equal(0xC0u, (id >> 24) & 0xFFu));
     }
 
+    [Fact]
+    public void BuildEntitiesFromInfo_AssignsOutdoorEffectCellWithoutChangingRenderParent()
+    {
+        var info = new LandBlockInfo
+        {
+            Objects =
+            {
+                new Stab
+                {
+                    Id = 0x01000001u,
+                    Frame = new Frame { Origin = new Vector3(25f, 49f, 0f) },
+                },
+            },
+        };
+
+        WorldEntity entity = Assert.Single(
+            LandblockLoader.BuildEntitiesFromInfo(info, 0xA9B40000u));
+
+        // x cell 1, y cell 2 => 1 + 1*8 + 2 = 11 (0x0B).
+        Assert.Equal(0xA9B4000Bu, entity.EffectCellId);
+        Assert.Null(entity.ParentCellId);
+    }
+
     [Fact]
     public void BuildEntitiesFromInfo_LegacyZeroLandblockId_StartsAtOne()
     {