Keeper is a zmvm guest program that runs the block transition.
It relies on the zkvm maker implementing `getInput`. For now, we only
provide a single implementation for the 'ziren' VM.
Why keeper?
In the _Mass Effect_ lore, the keepers are animals (?) who maintain the
citadel. Nothing is known from them, and attempts at tampering with them
have failed, as they self-destruct upon inquiry. They have a secret,
nefarious purpose that is only revealed later in the game series, don't
want any spoilers so I didn't dig deeper. All in all, a good metaphor
for zkvms.
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Co-authored-by: weilzkm <140377101+weilzkm@users.noreply.github.com>
Co-authored-by: Felix Lange <fjl@twurst.com>
