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The mock can now emit speech_started/speech_stopped on a programmable schedule keyed by input_audio_buffer.append count. Used by the slice-4 secondary-path e2e to exercise the brain advisory → reflex path. The schedule is shared via an Arc<Mutex<_>> so set_advisory_schedule right after start() is picked up by accepted connections. Signed-off-by: Aaron D. Lee <himself@adlee.work>