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/OrderedResourceTeardown.cs

@@ -0,0 +1,36 @@
+namespace AcDream.App.Rendering;
+
+/// <summary>
+/// Runs dependency-ordered resource teardown one stage at a time. A failed
+/// stage remains current, so a later <see cref="Advance"/> retries exactly
+/// that owner before any dependent resource can be destroyed.
+/// </summary>
+internal sealed class OrderedResourceTeardown(params Action[] stages)
+{
+    private readonly Action[] _stages = stages ?? throw new ArgumentNullException(nameof(stages));
+    private int _nextStage;
+    private bool _advancing;
+
+    public bool IsComplete => _nextStage == _stages.Length;
+    internal int NextStage => _nextStage;
+
+    public void Advance()
+    {
+        if (_advancing || IsComplete)
+            return;
+
+        _advancing = true;
+        try
+        {
+            while (_nextStage < _stages.Length)
+            {
+                _stages[_nextStage]();
+                _nextStage++;
+            }
+        }
+        finally
+        {
+            _advancing = false;
+        }
+    }
+}