* actually remove onnx
* fix: link clang_rt.osx and drop stale ORT build cache
ort-sys linked libclang_rt.osx.a, which also supplied ggml-metal's
___isPlatformVersionAtLeast. Without ORT, macOS arm64 builds targeting
11.0 fail to link, so Handy now links it directly.
Bump the rust-cache key so restored target dirs no longer carry ORT
leftovers like DirectML.dll, which broke Windows ARM64 signing.
* change acceleration string