Benchmark fixture provenance:
- Spoken text source: "Alice's Adventures in Wonderland" by Lewis Carroll (1865), public domain.
- The bundled WAV corpus is generated locally from the excerpt in benchmark_audio.txt to keep the benchmark deterministic and self-contained for development.
- `benchmark_audio.wav` is the full 32.6 second clip.
- `benchmark_audio_medium.wav` and `benchmark_audio_short.wav` are leading excerpts cut from the full clip for a small bundled suite.
