The engine-flip tile: re-present the same page through a different engine with the user's place and session carried across. Portable view-state + donor/back/receiver contracts (api), the one-hop degrade-never-block orchestrator (flip), the black-box system-WebView receiver (scry), and, behind the serval-donor feature, the glass-box serval donor. Consolidated 2026-07-09 from the mere workspace's verso / verso-api / verso-scry / verso-serval per the inker-serval adoption plan; the flip is the dynamic counterpart of inker's per-address multiplexer.