fix: keep exact snapping, source drawing data and adaptive options layout

Resolve curve intersections through cadkernel, retain empty exact results, gather analytic candidates independently of tessellation, and bound material uploads. Preserve large MINSERT data while limiting rendering work; remove obsolete review narratives.

src/scene/pipeline/wire_gpu.rs

@@ -1148,11 +1148,6 @@ impl WireGpu {
 
         let _ = const_bgl;
         let max_packed_instances = super::gpu_budget::max_elements::<PackedWireInstance>(device);
-        // Same fan-out the native path above uses: emitting a wire reads that
-        // wire and the depth map and writes nothing shared, and a selection
-        // large enough to be slow is exactly where it pays. `collect` on an
-        // indexed parallel iterator keeps the order, which the instance indices
-        // depend on.
         use crate::par::prelude::*;
         let per: Vec<Vec<PackedWireInstance>> = wires
             .par_iter()