forked from 1b-agent/opencadstudio-upstream
- Operation::CreateViewport(ViewportSpec) appended to the wire enum (append-only). - backend add_viewport (center/width/height/view_target/view_height). - Viewport bounds (center +- w/2,h/2), transform (moves center), ensure_transformable. - facade EntityCollection::create_viewport; spec Viewport family; api_reference + binding_schema regenerated; mocks updated. - Test phase4_create_viewport_bounds_transform -> 600 host lib green. - IMPLEMENTATION.md: Phase 4 done (set_view/view-query remaining).