Add an entrypoint

[grypez]

The current daemon commands use yarn as an assumed-available PATH entry. We should provide an installer to put ocap-kernel (or ok) on the PATH, pointing to the @ocap/cli. Can we make npm install @metamask/ocap-kernel do this? Is that... a bad idea? Maybe we should prefer npm install @metamask/ocap-kernel-cli or npx -p @metamask/ocap-kernel-cli -- -d ~/.ocap-kernel/

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