forked from 1b-agent/opencadstudio-upstream
- SetViewportView op + GetViewportView query (append-only). - backend set_viewport_view (update Viewport.view_target/view_height) + viewport_view. - facade Entity::set_view/viewport_view (Viewport returns Entity). - spec Viewport methods; api_reference + binding_schema regenerated; mocks + baseline. - Test phase4_set_view_and_view_query -> 609 host lib + 3 consistency green. - Phase 4 complete.