Raster-image quad corners derive from a large f64 insertion point plus
small u/v spans; the single-f32 cast quantized them at UTM scale. The
ImageModel now keeps a corners_low residual, ImageVertex carries pos_low
(location 2), and image.wgsl reconstructs the eye-relative position from
the high/low pair.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Move the 30 flat modules under src/scene/ into six folders by role:
convert (entity→geometry), text (fonts/shaping), model (render models),
pick (hit-test/selection/grips/xclip), view (camera/transform/render),
cache (block + property caches). pipeline/ is unchanged.
Full path migration — all `scene::X` references become
`scene::<group>::X`, no compatibility re-exports. render.rs items that
were `pub(super)` (parent was scene) become `pub(in crate::scene)` to
keep their original scene-wide visibility.
No behavior change; build and tests are green.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
