feat(render): unify physical residency accounting

src/AcDream.App/Rendering/Residency/DelegateResidencyDomainSource.cs

@@ -0,0 +1,22 @@
+namespace AcDream.App.Rendering.Residency;
+
+internal sealed class DelegateResidencyDomainSource(
+    ResidencyDomain domain,
+    Func<ResidencyDomainSnapshot> capture) : IResidencyDomainSource
+{
+    private readonly Func<ResidencyDomainSnapshot> _capture =
+        capture ?? throw new ArgumentNullException(nameof(capture));
+
+    public ResidencyDomain Domain { get; } = domain;
+
+    public ResidencyDomainSnapshot CaptureResidency()
+    {
+        ResidencyDomainSnapshot snapshot = _capture();
+        if (snapshot.Domain != Domain)
+        {
+            throw new InvalidOperationException(
+                $"Residency source {Domain} returned {snapshot.Domain}.");
+        }
+        return snapshot;
+    }
+}