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* fix: add error handling for podcast generation failures When TTS processing fails, the system was generating 0-second audio files without any error indication. This fix adds: 1. Track failed TTS lines and log warning with indices 2. Raise ValueError when all TTS generation fails with helpful message 3. Check for empty audio output in mix_audio and raise error 4. Log success/failure ratio for debugging Fixes #30 * fix: address Copilot review feedback - Use `not audio` to catch both None and empty bytes - Log failed lines with 1-based indices for user-friendly output - Handle empty script case with clear error message - Validate env vars before ThreadPoolExecutor for fast-fail on config errors --------- Co-authored-by: Willem Jiang <willem.jiang@gmail.com>