nix develop: Go, gopls, shellcheck, make, curl, jq, Python, Node.js,
oxipng and ImageMagick; on Linux also Ghostty, Xvfb, xdotool, DejaVu fonts
and Chromium for the README screenshots and the webOS app.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>