perf(streaming): scope reveal warmup spatially

Source composite warmup from the canonical published destination neighborhood, including quiesced static and live projections, instead of rescanning the retained Far-tier world after every membership edge.

This lifecycle correction applies to both draw paths, preserving ef1d263337 as the sole G4 visual rollback.

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

tests/AcDream.App.Tests/Rendering/Wb/CompositeWarmupEntitySourceTests.cs

@@ -0,0 +1,61 @@
+using AcDream.App.Rendering.Wb;
+using AcDream.App.Streaming;
+using AcDream.Core.World;
+using DatReaderWriter.DBObjs;
+using System.Numerics;
+
+namespace AcDream.App.Tests.Rendering.Wb;
+
+public sealed class CompositeWarmupEntitySourceTests
+{
+    [Fact]
+    public void RefreshTracksOnlyDestinationNeighborhoodMembership()
+    {
+        var center = Entity(1);
+        var neighbor = Entity(2);
+        var far = Entity(3);
+        var world = new GpuWorldState();
+        world.AddLandblock(Landblock(0x1010FFFFu, center));
+        world.AddLandblock(Landblock(0x1110FFFFu, neighbor));
+        world.AddLandblock(Landblock(0x1310FFFFu, far));
+        var source = new CompositeWarmupEntitySource(world);
+
+        source.Refresh(0x10100001u, radius: 1);
+
+        Assert.Equal(world.FlatViewGeneration, source.Generation);
+        Assert.Equal([center, neighbor], source.Entities);
+    }
+
+    [Fact]
+    public void RefreshObservesLaterMembershipWithoutReplacingItsStableView()
+    {
+        var center = Entity(1);
+        var later = Entity(2);
+        var world = new GpuWorldState();
+        world.AddLandblock(Landblock(0x1010FFFFu, center));
+        var source = new CompositeWarmupEntitySource(world);
+        source.Refresh(0x10100001u, radius: 0);
+        IReadOnlyList<WorldEntity> stableView = source.Entities;
+
+        world.AddLandblock(Landblock(0x1010FFFFu, center, later));
+        source.Refresh(0x10100001u, radius: 0);
+
+        Assert.Same(stableView, source.Entities);
+        Assert.Equal([center, later], source.Entities);
+        Assert.Equal(world.FlatViewGeneration, source.Generation);
+    }
+
+    private static LoadedLandblock Landblock(
+        uint id,
+        params WorldEntity[] entities) =>
+        new(id, new LandBlock(), entities);
+
+    private static WorldEntity Entity(uint id) => new()
+    {
+        Id = id,
+        SourceGfxObjOrSetupId = 0x02000001u,
+        Position = Vector3.Zero,
+        Rotation = Quaternion.Identity,
+        MeshRefs = Array.Empty<MeshRef>(),
+    };
+}