Maintain and manage AI-readable project metadata in a per-repo `.project/` folder (project.json + overview.md) with scripts for init/read/update/validate/format/render and incremental updates based on git commits since updated_at. Use when Codex needs to create/update `.project` info or answer questions about a repository’s overview/stack/architecture (including Chinese requests like “项目信息/项目概况/技术栈/项目架构/根据 git 提交更新”).