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/BPY_extern.hh

@@ -111,6 +111,8 @@ void BPY_DECREF_RNA_INVALIDATE(void *pyob_ptr);
  * \param C: The context to set. In rare cases C can be null.
  */
 void BPY_context_set(bContext *C);
+/** Return the context currently published through the real bpy.context slot. */
+bContext *BPY_context_get();
 /**
  * Use for updating while a python script runs - in case of file load.
  * \param C: The context to activate as `bpy.context`. In rare cases C can be null.