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/quad/ with main.cpp, CMakeLists.txt - Add GLSL shaders (quad.vert, quad.frag) for textured quad rendering - Use OpenGLVertexArray, OpenGLBuffer, OpenGLShader, OpenGLPipelineState - Add OpenGLTexture::LoadFromFile for texture loading (earth.png) - Add OpenGLSampler for texture sampling configuration - Disable depth test for 2D quad rendering - GT.ppm generated from OpenGL rendering output (0% diff on re-run)
