refactor(render): compose render frame orchestrator

Move the accepted draw transaction and failure recovery behind typed frame-phase owners so GameWindow only supplies immutable frame input. Preserve retail draw order, make ImGui/bootstrap shutdown ownership explicit, and restore exact text-render GL state on failures.\n\nCo-authored-by: Codex <codex@openai.com>

src/AcDream.App/Rendering/RenderFramePreparationController.cs

@@ -0,0 +1,35 @@
+namespace AcDream.App.Rendering;
+
+internal interface IRenderWeatherFramePhase
+{
+    void Tick(double deltaSeconds);
+}
+
+/// <summary>
+/// Preserves the accepted pre-world order after the GPU/resource transaction:
+/// begin optional developer UI, advance render-time weather, then hand the
+/// completed preparation to the world phase.
+/// </summary>
+internal sealed class RenderFramePreparationController : IRenderFrameResourcePhase
+{
+    private readonly IRenderFrameResourcePhase _resources;
+    private readonly IDevToolsFrameLifecycle? _devTools;
+    private readonly IRenderWeatherFramePhase _weather;
+
+    public RenderFramePreparationController(
+        IRenderFrameResourcePhase resources,
+        IDevToolsFrameLifecycle? devTools,
+        IRenderWeatherFramePhase weather)
+    {
+        _resources = resources ?? throw new ArgumentNullException(nameof(resources));
+        _devTools = devTools;
+        _weather = weather ?? throw new ArgumentNullException(nameof(weather));
+    }
+
+    public void Prepare(RenderFrameInput input)
+    {
+        _resources.Prepare(input);
+        _devTools?.BeginFrame((float)input.DeltaSeconds);
+        _weather.Tick(input.DeltaSeconds);
+    }
+}