Refactor FATE

I was looking at the warnings we suppress in `ZooStore` and they all seem to stem from the serialization of the generics. I was wondering if it would be better to refactor out the generic types so we don't have to arbitrarily serialize objects and blindly cast them. This would be a bit of work but it might not be too bad. I think if we create an interface like `FateEnvironment` to pass to the operations we wouldn't have to pass the Manager around.

Start by reviewing the warnings and generic serialization in ZooStore, then trace how operations receive and use Manager. The issue proposes introducing a FateEnvironment interface, but does not identify the affected files or tests. Done would require an agreed design and a completed refactor that removes the arbitrary serialization and blind casts.

Written by the indexing model from the issue text.