chore: checkpoint web Blender feature-gap work, docs and tests

- update native web_engine sources and rebuilt wasm artifacts
- add task cards, status notes and tooling scripts
- add web e2e specs, tutorial UI sources and tutorial assets
- sync golden task manifests and audit records

Co-Authored-By: Claude Code <noreply@anthropic.com>

web/tests/fixtures/wbv2-operator-sweep/surface.json

@@ -0,0 +1,8 @@
+[
+ "surface.primitive_nurbs_surface_circle_add",
+ "surface.primitive_nurbs_surface_curve_add",
+ "surface.primitive_nurbs_surface_cylinder_add",
+ "surface.primitive_nurbs_surface_sphere_add",
+ "surface.primitive_nurbs_surface_surface_add",
+ "surface.primitive_nurbs_surface_torus_add"
+]