Creates the core installer script with:
- ASCII banner and ANSI color utility functions (info/success/warn/error/prompt_user)
- Automatic terminal color support detection
- Platform detection (macOS, Linux, WSL, Windows/MINGW)
- Bun detection, version checking (>=1.1.14), and auto-installation
- uv detection and auto-installation
- find_bun_path() helper returning full path to bun binary
- --non-interactive flag for curl|bash piping safety
- All dependency patterns translated from plugin/scripts/smart-install.js
Passes bash -n syntax check and shellcheck with zero warnings.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Alex Newman