A step-by-step guide for setting up a brand-new Mac for development — from a bare shell to a fully configured zsh + Oh My Zsh + Starship + Nerd Font + Claude Code + Gemini CLI environment.
Assumption: You have a fresh macOS install and cmux (or any terminal) is already available. Everything else is installed from scratch below.
Run the steps in order. Each step assumes the previous ones succeeded.