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/FramePacingPolicyTests.cs

@@ -0,0 +1,63 @@
+using AcDream.App.Rendering;
+
+namespace AcDream.App.Tests.Rendering;
+
+public sealed class FramePacingPolicyTests
+{
+    [Fact]
+    public void VSync_request_uses_driver_swap_without_software_limit()
+    {
+        var policy = FramePacingPolicy.Resolve(
+            requestedVSync: true,
+            uncappedRendering: false,
+            monitorRefreshHz: 144);
+
+        Assert.True(policy.UseVSync);
+        Assert.Null(policy.SoftwareLimitHz);
+    }
+
+    [Theory]
+    [InlineData(60)]
+    [InlineData(120)]
+    [InlineData(144)]
+    public void Normal_VSync_off_uses_active_monitor_refresh_limit(int refreshHz)
+    {
+        var policy = FramePacingPolicy.Resolve(
+            requestedVSync: false,
+            uncappedRendering: false,
+            monitorRefreshHz: refreshHz);
+
+        Assert.False(policy.UseVSync);
+        Assert.Equal((double)refreshHz, policy.SoftwareLimitHz);
+    }
+
+    [Theory]
+    [InlineData(null)]
+    [InlineData(0)]
+    [InlineData(-1)]
+    public void Missing_or_invalid_monitor_refresh_uses_safe_fallback(int? refreshHz)
+    {
+        var policy = FramePacingPolicy.Resolve(
+            requestedVSync: false,
+            uncappedRendering: false,
+            monitorRefreshHz: refreshHz);
+
+        Assert.False(policy.UseVSync);
+        Assert.Equal(FramePacingPolicy.FallbackRefreshHz, policy.SoftwareLimitHz);
+    }
+
+    [Theory]
+    [InlineData(false)]
+    [InlineData(true)]
+    public void Explicit_uncapped_diagnostic_disables_both_pacing_mechanisms(
+        bool requestedVSync)
+    {
+        var policy = FramePacingPolicy.Resolve(
+            requestedVSync,
+            uncappedRendering: true,
+            monitorRefreshHz: 144);
+
+        Assert.False(policy.UseVSync);
+        Assert.Null(policy.SoftwareLimitHz);
+    }
+}