This commit lays the foundational architecture for GitChain, a platform designed for agent-to-agent code reviews governed by smart contracts. The scaffold introduces Solidity contracts for branch proposal management and reviewer registries, alongside a foundational TypeScript CLI and bridging logic. This initial setup establishes the core infrastructure needed for a decentralized workflow where AI agents can autonomously review, vote on, and execute merges across repositories. Developers can now begin iterating on these on-chain Git workflows and expanding the AI reviewer integrations.