This integration test proves wedge #1: loud synthetic caller audio
(samples = 1000, well above VAD_RMS_THRESHOLD = 500.0) sent through
LocalVadReflex<Reflex<TapAudioPipe>> trips the local VAD and kills
playout within one tick, without any brain advisory.
Cites README:98-100 and ARCHITECTURE.md:79-81 ("local reflexes that
don't need the brain"); see slice-4 spec §3.4, §6.1, and §7
done-criteria #8.
Signed-off-by: Aaron D. Lee <himself@adlee.work>