fix(rendering): bound portal resource lifetime

Separate logical ownership, render publication, and GPU retirement across live entities, landblocks, particles, textures, mesh arenas, portal/UI teardown, and per-frame scratch storage. Add bounded DAT/texture caches, upload budgets, three-frame fence retirement, exact-incarnation appearance reconciliation, frame pacing, and extensive lifetime conformance coverage.\n\nThe seven-destination connected route now cuts peak working/private memory roughly in half, returns Caul to 125-153 FPS locally, and produces no WER or AMD reset.\n\nCo-authored-by: OpenAI Codex <codex@openai.com>

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

@@ -81,4 +81,35 @@ public sealed class ContiguousRangeAllocatorTests
         Assert.Equal(small.Offset, selected.Offset);
         Assert.Equal(40, allocator.LargestFreeRange);
     }
+
+    [Fact]
+    public void ReleasingTailLowersLiveHighWaterAndAllowsTrim()
+    {
+        var allocator = new ContiguousRangeAllocator(100);
+        Assert.True(allocator.TryAllocate(20, out _));
+        Assert.True(allocator.TryAllocate(30, out MeshBufferRange tail));
+        Assert.Equal(50, allocator.HighWaterMark);
+
+        allocator.Release(tail);
+
+        Assert.Equal(20, allocator.HighWaterMark);
+        Assert.Equal(80, allocator.TrailingFreeLength);
+        allocator.Shrink(40);
+        Assert.Equal(40, allocator.Capacity);
+        Assert.Equal(20, allocator.HighWaterMark);
+        Assert.Equal(20, allocator.TrailingFreeLength);
+    }
+
+    [Fact]
+    public void InteriorReleaseDoesNotHideAHighLiveAllocation()
+    {
+        var allocator = new ContiguousRangeAllocator(100);
+        Assert.True(allocator.TryAllocate(20, out MeshBufferRange first));
+        Assert.True(allocator.TryAllocate(30, out _));
+
+        allocator.Release(first);
+
+        Assert.Equal(50, allocator.HighWaterMark);
+        Assert.Throws<InvalidOperationException>(() => allocator.Shrink(40));
+    }
 }