spider's start gate can use new wait_for_process_ready in process_lib

[dolled-possum]

As we've now created the first of probably two standard methods for one process to await readiness of another, spider should probably use it. Will reference the example.

[dolled-possum]

https://github.com/hyperware-ai/hyperdrive/blob/811216641f991bc6e531eac465fd298596cc8885/hyperdrive/packages/hypermap-cacher/binding-cacher/src/lib.rs#L1480C1-L1498C75