- load .forge.ron through bevy_forge_core into the live ECS (3D components)
- Ctrl+S syncs and saves the document; custom components are preserved
- transform undo/redo for inspector sliders and gizmo drags (Ctrl+Z/Y)
- F focus, Delete subtree, Ctrl+D duplicate; camera subtrees are guarded
- 66 runtime tests; workspace 412 passed; garden demo docs/screenshots
