v2.0.0-snapshot: Electron Migration + CLI System

- Complete rewrite from Tauri/Rust to Electron/Node.js
- PTY Daemon architecture (Named Pipe IPC)
- CLI system with daemon/sessions/worktree/agents subcommands
- Session recovery for Claude Code / OpenCode / Codex
- Git worktree isolation for agent sessions
- Dashboard: StatsCollector, NotifyCenter, TaskQueue
- 7 E2E user story test scenarios
- Comprehensive README documentation