Key points:\n- restore the tests tree removed by bc47e6e\n- capture current editor workspace, scene, and docs reshuffle changes\n- keep local cloud.nvdb resources ignored from this commit
- Add tests/RHI/OpenGL/integration/triangle/ with main.cpp, CMakeLists.txt - Add GLSL shaders (triangle.vert, triangle.frag) for vertex/fragment shading - Use OpenGLVertexArray, OpenGLBuffer, OpenGLShader, OpenGLPipelineState - Disable depth test to allow 2D triangle rendering - GT.ppm reused from D3D12 triangle test (0% diff)
