Hotfix for two live render errors:
- Kokoro chapter render failed with "count ('-1') must be non-negative"
— streaming-WAV chunk-size sentinel (0xFFFFFFFF) read as -1.
- Piper render timed out on book-chapter paragraphs with no sentence
punctuation — one giant segment exceeded the 2-min timeout.
Source fix: FlowerCore.TtsReader@826589b. 153/153 tests green.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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