perf(diag): complete trustworthy Slice A capture tooling

Correct whole-frame GPU timestamps so they bracket only the accepted render transaction and associate delayed query results with the owning CPU frame. Add route-wide frame-history summaries, fixed-camera screenshot comparison, process counters, contention traces, a pinned Arwic workload, and credential-safe launch disclosure.

The reference hardware/display contract now keeps local and RDP populations separate and defines the screenshot and re-baseline rules needed by later prepared-content gates.

Co-Authored-By: Codex <noreply@openai.com>

src/AcDream.App/Rendering/FrameProfilerGpuMeasurement.cs

@@ -0,0 +1,32 @@
+using AcDream.App.Diagnostics;
+using Silk.NET.OpenGL;
+
+namespace AcDream.App.Rendering;
+
+/// <summary>
+/// Production render-transaction measurement adapter. CPU frame boundaries
+/// remain owned by <see cref="FrameProfiler"/> while this adapter places the
+/// GPU query around only the GL-producing render phases.
+/// </summary>
+internal sealed class FrameProfilerGpuMeasurement : IRenderFrameGpuMeasurement
+{
+    private readonly FrameProfiler _profiler;
+    private readonly GL _gl;
+
+    public FrameProfilerGpuMeasurement(FrameProfiler profiler, GL gl)
+    {
+        _profiler = profiler ?? throw new ArgumentNullException(nameof(profiler));
+        _gl = gl ?? throw new ArgumentNullException(nameof(gl));
+    }
+
+    public void BeginFrame()
+    {
+        _profiler.FrameBoundary(_gl);
+        _profiler.BeginGpuFrame();
+    }
+
+    public void EndFrame()
+    {
+        _profiler.EndGpuFrame();
+    }
+}