Trigram VCS gives a new or existing codebase a durable project framework: canonical documentation, agent roles and operating rules, persistent project context, gated development phases, migration safeguards, and recovery-oriented tooling. Agents still do the coding; VCS provides structure it can return to instead of rediscovering the codebase every session. The goal is simple: start organized, stay organized, & make AI-assisted development more predictable without giving up control.