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/FixedEntityTextureOwnerLeaseTests.cs

@@ -0,0 +1,46 @@
+using AcDream.App.Rendering;
+using AcDream.App.Rendering.Wb;
+
+namespace AcDream.App.Tests.Rendering;
+
+public sealed class FixedEntityTextureOwnerLeaseTests
+{
+    [Fact]
+    public void RepeatedReplacementReleasesHistoricalKeysForTheFixedOwner()
+    {
+        const uint owner = 42;
+        var lifetime = new RegistryLifetime();
+        using var lease = new FixedEntityTextureOwnerLease(lifetime, owner);
+
+        lease.Replace(hasReplacement: true);
+        lifetime.Acquire(owner, "first");
+        Assert.Equal(1, lifetime.ResourceCount);
+
+        lease.Replace(hasReplacement: true);
+        lifetime.Acquire(owner, "second");
+        Assert.Equal(1, lifetime.ResourceCount);
+
+        lease.Replace(hasReplacement: true);
+        lifetime.Acquire(owner, "third");
+        Assert.Equal(1, lifetime.ResourceCount);
+
+        lease.Replace(hasReplacement: false);
+        Assert.Equal(0, lifetime.ResourceCount);
+        Assert.Equal(3, lifetime.ReleaseCount);
+    }
+
+    private sealed class RegistryLifetime : IEntityTextureLifetime
+    {
+        private readonly OwnerScopedResourceRegistry<string> _registry = new();
+        public int ResourceCount => _registry.ResourceCount;
+        public int ReleaseCount { get; private set; }
+
+        public void Acquire(uint owner, string key) => _registry.Acquire(owner, key);
+
+        public void ReleaseOwner(uint localEntityId)
+        {
+            ReleaseCount++;
+            _registry.ReleaseOwner(localEntityId);
+        }
+    }
+}