chore: checkpoint web Blender migration source, tools and docs

Accumulated uncommitted work: GHOST Web backend, WebGL/GPU web layer,
web workflow engine and protocol, tooling, docs and task records.
Large generated evidence, user-testing archives, build snapshots and
imported test assets remain untracked.

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

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

@@ -50,3 +50,6 @@ 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()

blender-5.2.0/source/blender/python/mathutils/mathutils.cc

@@ -863,6 +863,7 @@ PyMODINIT_FUNC PyInit_mathutils()
   PyModule_AddType(mod, &color_Type);
 
   /* submodule */
+#ifndef MATH_WEB_CORE_ONLY
   PyModule_AddObject(mod, "geometry", (submodule = PyInit_mathutils_geometry()));
   /* XXX, python doesn't do imports with this usefully yet
    * 'from mathutils.geometry import PolyFill'
@@ -889,6 +890,7 @@ PyMODINIT_FUNC PyInit_mathutils()
   PyC_Module_AddToSysModules(sys_modules, submodule);
 #endif
 
+#endif
   mathutils_matrix_row_cb_index = Mathutils_RegisterCallback(&mathutils_matrix_row_cb);
   mathutils_matrix_col_cb_index = Mathutils_RegisterCallback(&mathutils_matrix_col_cb);
   mathutils_matrix_translation_cb_index = Mathutils_RegisterCallback(