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.Core/World/MeshRef.cs

@@ -21,9 +21,8 @@ public readonly record struct MeshRef(uint GfxObjId, Matrix4x4 PartTransform)
     /// bind a sub-mesh's texture, it consults this map. A hit means
     /// "use the base Surface's colors/flags/palette but swap its
     /// <c>OrigTextureId</c> for the value here." The renderer calls
-    /// <c>TextureCache.GetOrUploadWithOrigTextureOverride</c> which caches
-    /// the decoded result under a composite key so multiple entities can
-    /// share the same override without redecoding.
+    /// the owning renderer resolves an owner-scoped composite. Equivalent
+    /// live entities may share it, and the final owner releases it.
     /// </para>
     /// <para>
     /// Null means "no overrides, use each sub-mesh's native surface as-is."