refactor(lifetime): own render resource prefixes

Give terrain, sky, retained UI, portal preparation, and the update/render frame pair explicit single owners. Make shader, texture, text, bindless, and GL construction prefixes checked and retryable so partial failure cannot lose or replay resource ownership.

Co-authored-by: Codex <codex@openai.com>

src/AcDream.App/Rendering/GameRenderResourceLifetime.cs

@@ -0,0 +1,21 @@
+namespace AcDream.App.Rendering;
+
+/// <summary>
+/// Sole lifetime owner for render resources that are borrowed by, but not
+/// owned by, their renderers.
+/// </summary>
+internal sealed class GameRenderResourceLifetime
+{
+    private readonly OwnedResourceSlot<TerrainAtlas> _terrainAtlas = new();
+    private readonly OwnedResourceSlot<Shader> _skyShader = new();
+
+    public TerrainAtlas AcquireTerrainAtlas(Func<TerrainAtlas> factory) =>
+        _terrainAtlas.Acquire(factory);
+
+    public Shader AcquireSkyShader(Func<Shader> factory) =>
+        _skyShader.Acquire(factory);
+
+    public void ReleaseTerrainAtlas() => _terrainAtlas.Release();
+
+    public void ReleaseSkyShader() => _skyShader.Release();
+}