Add code review agent #133
Description
We currently have a make fmt -> make lint -> make test -> "run devnet" testing workflow, but it doesn't cover code quality. Also, sometimes Claude might forget this validation checklist.
We should add a code review agent, specialized in code quality. We can then document code smells or plain errors that we see to automatically improve code quality.
We can do something similar for writing tests, getting inspiration from leanSpec: https://github.com/leanEthereum/leanSpec/blob/main/.claude/agents/code-tester.md