Gold/baseline images for image-comparison regression tests. Test code lives next to whatever runs the comparison; this tree only holds the reference PNGs (and, where convenient, the small fixture script that drives capture).

• GPU-TESTING.md — engine-level GPU regression tests (rendering primitives, shaders, particles, etc.). Per-API gold images under Stride.<X>.Tests/<TestName>.<API>.png.
• Stride.Samples.Tests/ — end-to-end sample screenshot tests. Per-sample fixture + <Sample>/<frame>.png golds.

• ../docs/debugging/native-crashes.md — capturing & analyzing native access violations (GPU/audio/AOT) that crash a test silently.