hermes chat -q wired the interactive prompt_toolkit clarify callback
unconditionally, but a -q turn never builds the prompt_toolkit
application — the modal can never be painted or answered, so the turn
polls its response queue until agent.clarify_timeout expires (default
3600 s, 0 = unlimited). The gateway, cron jobs, the kanban dispatcher
and inter-agent wakeups all deliver work as -q turns. Route the
single-query case to a headless callback at the agent-construction site
that already knows _single_query_mode, mirroring _oneshot_clarify_callback
on the -z path (#94943; third member of the family after #86909 and
#88013).
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