* chore: deprecate and remove verbio, nuance speech vendor support
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* chore: also deprecate and remove PlayHT speech vendor
PlayHT was acquired and no longer provides the service.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>