Resolved conflicts:
- test/*: keep the shared Fixtures.h migration (drop the per-file
openGfxWindow copies that dev still had).
- vulkan/Graphics.cpp: keep dev's extName loop variable rename AND the
headless set_headless() line.
Local win32-debug build + headless/sampler/mocks/binding tests pass after
forcing a rebuild of EVProcgen (stale object from the pre-merge tree caused
a duplicate PbrTextureSet::destroy symbol).
西风逍遥游
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