Records the gap (no test exercised the wgpu path), the enabling refactor
(window/surface Optional + render_to_view split + offscreen readback),
the narrow smoke scope, and the lavapipe CI decision.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014TXbAwk27agwhrNNrhLi2U
