Plays a ding via soundd when the cruise warning sign becomes visible
(cruise set speed out of range vs speed limit) or when the speed limit
changes while the warning sign is already showing. Max 1 ding per 30s.
Ding is mixed independently into soundd output at max volume without
interrupting alert sounds. bench_cmd ding available for manual trigger.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
