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/tests/CMakeLists.txt

@@ -72,7 +72,8 @@ set(TEST_BLENDER_EXE_PARAMS_NO_THUMB
 )
 
 # Python CTests
-if(WITH_BLENDER AND WITH_PYTHON AND NOT WITH_PYTHON_MODULE)
+# WebEngine runs these sources through its browser harness, not a desktop CTest executable.
+if(WITH_BLENDER AND WITH_PYTHON AND NOT WITH_PYTHON_MODULE AND NOT WITH_WEB)
   add_subdirectory(python)
 endif()