A parent blocked inside delegate_task only drains its steer queue after the tool
returns, i.e. after the child finishes. On Telegram (busy_input_mode=steer, the
/steer command, and the PRIORITY path) the gateway queued the text on that parent
alone and acked "Steered into current run", so a looping delegated child never saw
it (#112095). Fan the text out to running_agent._active_children — the same
identity-scoped snapshot interrupt() uses — and make the ack say where it went.
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