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run_cts_local.py and the mobilegl-desktop VK-GL-CTS target were both in the tree with nothing describing how to reach them, so the only documented ways to run the suite needed either an Android device or a Windows box with a GPU. The desktop Linux path needs neither: lavapipe gives DirectVulkan a headless surface and Mesa's surfaceless EGL gives DirectGLES a context, so a single test group can be measured in seconds while working on it. Records the two things that cost time to find. EGL_PLATFORM=surfaceless is mandatory for DirectGLES - without a /dev/dri node Mesa fails eglInitialize on the default display, and MobileGL surfaces that as EGL_BAD_ALLOC from eglCreatePbufferSurface, which points at the wrong call entirely. And DirectVulkan's default-framebuffer readback returns zeros here exactly as it does on Adreno, so that defect is MobileGL's and reproducible without a phone. The direct_state_access reference table is the measured baseline for the fixes in this branch, so a later change has something to be compared against.