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>

tests/AcDream.App.Tests/Rendering/GameWindowRenderLeafCompositionTests.cs

@@ -182,8 +182,10 @@ public sealed class GameWindowRenderLeafCompositionTests
             "screenshotCaptured);");
         AssertAppearsInOrder(
             orchestrator,
-            "WorldRenderFrameOutcome world = _world.Render(input);",
+            "_gpuMeasurement.BeginFrame();",
+            "world = _world.Render(input);",
             "_presentation.Render(input, world);",
+            "_gpuMeasurement.EndFrame();",
             "new RenderFrameOutcome(world, presentation);",
             "_diagnostics.Publish(input, outcome);");
     }