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>

blender-5.2.0/source/blender/python/mathutils/CMakeLists.txt

@@ -50,6 +50,3 @@ set(LIB
 
 
 blender_add_lib(bf_python_mathutils "${SRC}" "${INC}" "${INC_SYS}" "${LIB}")
-if(WITH_WEB)
-  target_compile_definitions(bf_python_mathutils PRIVATE MATH_WEB_CORE_ONLY)
-endif()