polyvoice 0.6.6

Speaker diarization for Rust — who spoke when. ONNX-powered: Silero VAD, WeSpeaker embeddings, Pyannote segmentation, K-means/AHC clustering, overlap detection.
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# src/spectral

## Purpose

Spectral clustering using affinity matrix + Laplacian + eigendecomposition
via faer. Used by NmeScClusterer.

## Surfaces

- `spectral_cluster(embeddings, max_k) -> Vec<usize>`

## Dependencies

- `utils` — cosine_similarity
- `faer` — SVD/eigendecomposition

## Invariants

- Output labels are contiguous integers starting from 0.

## Verification

```bash
cargo test --lib spectral --features spectral
```

## Notes

- Requires `spectral` feature (pulls faer).