C0 left you with a starter you can build, run, and read — and a notepad of rough edges. In C1 you turn that understanding into a map Claude can use. A good CLAUDE.md is facts and soft conventions, not a wall of rules: it describes the project, the stack, the commands, the architecture, and the handful of conventions that keep the code healthy. No production code changes in this lab — the only file you commit is CLAUDE.md.
