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>

src/AcDream.App/Rendering/FixedEntityTextureOwnerLease.cs

@@ -0,0 +1,31 @@
+using AcDream.App.Rendering.Wb;
+
+namespace AcDream.App.Rendering;
+
+/// <summary>
+/// Balances one synthetic render owner's texture lifetime across replacement.
+/// The next draw reacquires only the replacement entity's current materials.
+/// </summary>
+internal sealed class FixedEntityTextureOwnerLease : IDisposable
+{
+    private readonly IEntityTextureLifetime _lifetime;
+    private readonly uint _ownerLocalId;
+    private bool _active;
+
+    public FixedEntityTextureOwnerLease(IEntityTextureLifetime lifetime, uint ownerLocalId)
+    {
+        _lifetime = lifetime ?? throw new ArgumentNullException(nameof(lifetime));
+        if (ownerLocalId == 0)
+            throw new ArgumentOutOfRangeException(nameof(ownerLocalId));
+        _ownerLocalId = ownerLocalId;
+    }
+
+    public void Replace(bool hasReplacement)
+    {
+        if (_active)
+            _lifetime.ReleaseOwner(_ownerLocalId);
+        _active = hasReplacement;
+    }
+
+    public void Dispose() => Replace(hasReplacement: false);
+}