WASM that runs in wasmtime will not run in the library

Hello, I have a Rust hello world app:

```
fn main() {
println!("Hello, world!");
}
```

I compile it:

```
cargo build --target wasm32-wasi
```

and can run it in wasmtime `wasmtime run hello-world.wasm` without issue. However, when I run it in my C# app:

```
// See https://aka.ms/new-console-template for more information
using Wasmtime;

var config = new Config();
config.WithWasmThreads(true);
using var engine = new Engine(config);

using var module = Module.FromFile(engine, "hello-world.wasm");

using var linker = new Linker(engine);
using var store = new Store(engine);

var instance = linker.Instantiate(store, module);
var run = instance.GetAction("run")!;
run();
```

and I get this error:

```
Wasmtime.WasmtimeException: 'unknown import: `wasi_snapshot_preview1::fd_write` has not been defined'
```

any thoughts?