Renderer requested by an application, including automatic capability selection.
Remarks
'auto' tries WebGPU, WebGL2, then Canvas 2D during initialization and runtime recovery. An
explicit 'webgpu' request reports failure instead of silently falling back. An explicit
'webgl2' request falls back to Canvas 2D when WebGL2 is unavailable or cannot recover.
Renderer requested by an application, including automatic capability selection.