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/OwnerScopedResourceRegistryTests.cs

@@ -0,0 +1,44 @@
+using AcDream.App.Rendering;
+
+namespace AcDream.App.Tests.Rendering;
+
+public sealed class OwnerScopedResourceRegistryTests
+{
+    [Fact]
+    public void RepeatedAcquireBySameOwnerIsIdempotent()
+    {
+        var registry = new OwnerScopedResourceRegistry<string>();
+
+        Assert.True(registry.Acquire(1, "shared"));
+        Assert.False(registry.Acquire(1, "shared"));
+        Assert.Equal(1, registry.OwnerCount);
+        Assert.Equal(1, registry.ResourceCount);
+        Assert.Equal(["shared"], registry.ReleaseOwner(1));
+    }
+
+    [Fact]
+    public void SharedResourceRetiresOnlyAfterFinalOwner()
+    {
+        var registry = new OwnerScopedResourceRegistry<string>();
+        registry.Acquire(1, "shared");
+        registry.Acquire(2, "shared");
+
+        Assert.Empty(registry.ReleaseOwner(1));
+        Assert.Equal(1, registry.ResourceCount);
+        Assert.Equal(["shared"], registry.ReleaseOwner(2));
+        Assert.Equal(0, registry.ResourceCount);
+    }
+
+    [Fact]
+    public void ReleaseOwnerReturnsAllNewlyUnownedResourcesOnce()
+    {
+        var registry = new OwnerScopedResourceRegistry<int>();
+        registry.Acquire(7, 10);
+        registry.Acquire(7, 20);
+
+        Assert.Equal([10, 20], registry.ReleaseOwner(7).Order());
+        Assert.Empty(registry.ReleaseOwner(7));
+        Assert.Equal(0, registry.OwnerCount);
+        Assert.Equal(0, registry.ResourceCount);
+    }
+}