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/Wb/IWbMeshAdapter.cs

@@ -1,5 +1,25 @@
 namespace AcDream.App.Rendering.Wb;
 
+/// <summary>
+/// Reports the physical outcome when a mesh-reference callback cannot provide
+/// the normal strong exception guarantee. <see cref="MutationCommitted"/> lets
+/// a transactional owner reconcile its marker without guessing whether a
+/// throwing backend already changed the reference count.
+/// </summary>
+public sealed class MeshReferenceMutationException : Exception
+{
+    public MeshReferenceMutationException(
+        string message,
+        bool mutationCommitted,
+        Exception innerException)
+        : base(message, innerException)
+    {
+        MutationCommitted = mutationCommitted;
+    }
+
+    public bool MutationCommitted { get; }
+}
+
 /// <summary>
 /// Mockable interface over <see cref="WbMeshAdapter"/> so adapters that
 /// drive ref-count lifecycle (e.g. LandblockSpawnAdapter, EntitySpawnAdapter)
@@ -7,7 +27,17 @@ namespace AcDream.App.Rendering.Wb;
 /// </summary>
 public interface IWbMeshAdapter
 {
+    /// <summary>
+    /// Acquires one logical reference. A normal exception guarantees that no
+    /// reference was acquired; <see cref="MeshReferenceMutationException"/>
+    /// explicitly reports the exceptional backend case where it was committed.
+    /// </summary>
     void IncrementRefCount(ulong id);
+
+    /// <summary>
+    /// Releases one logical reference under the same committed-outcome contract
+    /// as <see cref="IncrementRefCount"/>.
+    /// </summary>
     void DecrementRefCount(ulong id);
 
     /// <summary>