`computer_use` carried two Bot Screen actions, `request_handoff` and `wait_for_human`, that let
the model ask for the screen and then block a tool call until the human handed it back. Both only
make sense when a person is guaranteed to be watching the Desktop pane; from Telegram, the CLI or
a cron worker the request lands nowhere and the wait burns minutes before returning. The blocking
wait also fought the sequential tool deadline (600 s default vs 420 s), so the model saw a timeout
before the wait returned while the thread stayed parked.
The agent now simply says what it needs in its reply and ends the turn; the user takes over from
the pane, does the step, hands back and tells it to continue. Take over / hand back and every fence
(actions refused with human_has_control, epoch-voided results, suppressed thumbnails) are
unchanged. Removes the handoff module, the schema entries and their host-conditional rewriter,
the lease's pending_handoff field and wait helpers, and the "Bot needs you" badge in the pane.
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