Whisper models v1

Whisper ONNX model weights downloaded on demand by Vocal Slice.

These are the onnx-community/*_timestamped conversions of OpenAI's Whisper models,
redistributed unmodified under Apache-2.0. The app verifies every file against the
SHA-256 checksums in the manifest it ships with, so these assets are not a trust
boundary.

Not an application release: it carries no installer and no latest.yml, and is marked
as a prerelease so the auto-updater ignores it.