Add example that uses `load` and `store`

I've been trying to create a fixed length of memory and load from it. I keep getting

```
terminated by signal SIGSEGV (Address boundary error)
```

If you could add an example showing such a usecase it would be very helpful.

Start by locating the repository's existing examples and any current `load` and `store` usage. Add an example showing fixed-length memory allocation and safe loading and storing, and confirm it runs without the reported SIGSEGV.

Written by the indexing model from the issue text.