v0.5.2

## What's changed

- GGML CLI commands are quiet by default: native qwentts.cpp and Metal diagnostics no longer flood successful runs. The final `Wrote ...` message remains visible.
- Model download progress remains visible, and native diagnostics are shown if a command fails.
- Use `faster-qwen3-tts --verbose ...` to show native diagnostics while troubleshooting. Place `--verbose` before the subcommand.

The package version and demo pins are now 0.5.2.

Full changes: https://github.com/andimarafioti/faster-qwen3-tts/pull/142