Viktor's tour-guide redo (tripit#30/#31): narration audio is baked-audio-only
now — the fill-tour-audio worker synthesizes the queued (story, telling,
voice) audio while the tts stack's off-peak window (02:00-06:00) has
Chatterbox scaled up. Two idempotent passes: 02:20 after scale-up + model
load, 04:30 insurance against a skipped window or guard yield. Daytime runs
record tts_unreachable and exit quietly by design.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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