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/bmesh/CMakeLists.txt

@@ -181,6 +181,8 @@ if(WITH_WEB)
     PRIVATE bf::intern::guardedalloc
     extern_rangetree
     PRIVATE bf::intern::atomic
+    PRIVATE bf_intern_rigidbody
+    PRIVATE bf::dependencies::optional::bullet
   )
 else()
   set(LIB