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- Auto-detect language and switch from .en to multilingual model when needed - Detect speech onset in WAV to strip hallucinated words before speech begins - Merge whisper-cpp token fragments: contractions (didn + 't → didn't), split capitals (C + aught → Caught), dropped-g (shin + in' → shinin') - Interpolate zero-duration word clusters for reliable karaoke timing - Replace non-null assertions with optional chaining in tests Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>