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The Android and Windows paths each have a skill; the desktop Linux one had only a runner script and a README section, so it was the least discoverable of the three despite being the one to reach for while iterating - it needs no device and no GPU, and a single test group takes seconds rather than hours. Records what the other two skills cannot: that the toolchain has to be GCC 13+ or Clang 20+ (Clang 18 reports __cpp_concepts as 201907L, which switches libstdc++'s <expected> off and breaks the shader transpiler), that EGL_PLATFORM=surfaceless is mandatory for DirectGLES and why the symptom points at the wrong call, and which of this environment's results are MobileGL's own versus artefacts of software rendering. Also states the rule the other skills only imply: report Espryt and Magma separately. They fail different cases, and one combined number hides which backend a change moved.