Paste or drop a text document (up to about 6,000 tokens). The planner picks local, split or server for this device with prefer: "cost", the summary streams in, and the status line says what was chosen, why, what was cached, and at the end the speed, the server's share of the cost, and the privacy band at the split point. What leaves this device in split mode is the hidden state at boundary N; a server can recover input tokens from it at the rate the band shows. Local mode sends nothing.