feat: add Node WASM CLI

[hi-ogawa-agent]

• closes Add native/WASM split-runtime parity test #56

Summary

• add a Node CLI around the existing web-target Rust/WASM separation driver
• implement a filesystem-backed onnxruntime-web WASM host
• accept the native CLI model/mode/shift options and write float32 WAV stems
• document the command and its current 44.1 kHz WAV constraint

Part of #56. This intentionally does not add native/WASM parity verification yet.

Checks

• pnpm build-wasm
• pnpm lint-check
• CLI smoke test through WAV decode and WASM initialization (stopped at missing local model files)

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	demucs-onnx	d546794	Commit Preview URL Branch Preview URL	Jul 12 2026, 12:39 PM