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/World/LiveEntityTeardown.cs

@@ -31,3 +31,48 @@ internal static class LiveEntityTeardown
                 failures);
     }
 }
+
+/// <summary>
+/// A stable teardown plan whose successful steps are committed individually.
+/// The plan itself stays on the live-record tombstone, so retrying a later
+/// failed owner never replays an earlier ExitWorld notification or release.
+/// </summary>
+internal sealed class LiveEntityTeardownPlan
+{
+    private readonly Action[] _steps;
+    private readonly bool[] _completed;
+
+    public LiveEntityTeardownPlan(IEnumerable<Action> steps)
+    {
+        ArgumentNullException.ThrowIfNull(steps);
+        _steps = [.. steps];
+        _completed = new bool[_steps.Length];
+    }
+
+    internal int CompletedCount => _completed.Count(static completed => completed);
+    internal bool IsComplete => CompletedCount == _steps.Length;
+
+    public void Advance()
+    {
+        List<Exception>? failures = null;
+        for (int i = 0; i < _steps.Length; i++)
+        {
+            if (_completed[i])
+                continue;
+            try
+            {
+                _steps[i]();
+                _completed[i] = true;
+            }
+            catch (Exception error)
+            {
+                (failures ??= []).Add(error);
+            }
+        }
+
+        if (failures is not null)
+            throw new AggregateException(
+                "One or more live-entity component teardown steps failed.",
+                failures);
+    }
+}