Feature: GUI installer wrapper using Tauri

[ProjectLiminality]

Description

Create a cross-platform GUI installer that wraps the existing shell scripts (install.sh for macOS/Linux, install.ps1 for Windows) to provide a more user-friendly installation experience.

Rationale

• Terminal-based installation can be intimidating for non-technical users
• GUI provides visual progress feedback and clearer error messages
• Can be bundled with GitHub releases for canonical download experience
• Post-call summary emails could link directly to installer download

Technical Approach

Tauri is the recommended framework:

• Lightweight (~10MB vs Electron's ~150MB)
• Rust backend can shell out to install scripts
• Native system integration for permissions/elevation
• Cross-platform (macOS, Windows, Linux)

Implementation Notes

• GUI wraps existing scripts rather than reimplementing logic
• Scripts remain the source of truth for installation steps
• GUI provides: progress display, log viewing, error reporting, skip/retry options
• Bundle installers with GitHub releases (one per platform)

Scope

• Tauri project setup
• Basic UI: welcome, progress, completion screens
• macOS: wrap install.sh
• Windows: wrap install.ps1
• Linux: wrap install.sh
• GitHub release automation
• Update post-call emails to link to installer downloads

Priority

Post-private-beta polish. Current terminal-based installation works; this is UX enhancement.