- Remove `zen-setup` binary from package.json and package-lock.json
- Replace manual setup steps with `npx @zen/start` CLI command
- Simplify INSTALL.md by reducing steps from 6 to 4
- Update DEV.md to reflect removal of zen-setup from CLI scripts
- Fix relative path to `.env.example` in documentation
Update all references across source files, documentation, and
configuration to reflect the new package scope and name. This includes
updating `.npmrc` registry config, install instructions, module
examples, and all import path comments throughout the codebase.