Race-day audio on every page + TTS cold-start warm-up/watchdog#371
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…tart fixes Field reports, same session: 1. Callouts only played on the Live Race Control page — the whole audio stack (player, speech queue, start/end tones, lap detection) lived in that screen and died on navigation. It now lives in an app-shell controller (raceDayAudio.svelte.ts) mounted once from App.svelte, consuming the same app-wide live stream the global header uses: a running race is audible from marshaling, rounds, results — anywhere. The Live page keeps the Callouts toggle + control-click unlocks, driving the shared instance. Bonus: page navigation no longer remounts the detectors, so returning to Live mid-race can never re-buzz the start tone. 2. ~13s of race with no tones or callouts. MEASURED the pipeline first: a scratch heat instrumented at 200ms poll showed passes visible in the live projection 0.22-0.50s (median 0.33s) after the crossing — the data path is sub-half-second. The stall is the browser TTS engine: its first-ever utterance can take seconds or die SILENTLY while the backend spins up, and the serialized queue dammed every later callout behind the corpse. Two fixes: warmUp() speaks a volume-0 utterance on the RD's first gesture (the same one-time unlock that resumes the AudioContext), and a per-utterance dead-engine WATCHDOG (6s) that cancels + advances so one swallowed utterance can never silence the rest of the race. Noted for a later slice: adapter-appended passes carry no recorded_at (the latency measurement had to poll live instead of reading the log). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Two field reports: callouts stopped when leaving the Live page (the audio stack lived in that screen), and ~13s of race passed before the first tone/callout.
624 rd-console tests green (audio tests now mount the controller like the app shell does; new watchdog/warm-up unit tests), both svelte-checks clean, eslint+prettier clean.
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