## Summary
- replace add-dependency command execution with a cross-platform
node-pty runner in the Electron main process
- preserve add-dependency output and failure handling while adding PTY
output normalization and command timeouts
- package node-pty correctly in Electron Forge by externalizing it from
Vite, rebuilding it, and unpacking its helper binaries

## Test plan
- npm run fmt
- npm run lint:fix
- npm run ts
- npm test
- npm run build

🤖 Generated with Claude Code
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---------
Co-authored-by: Will Chen <7344640+wwwillchen@users.noreply.github.com>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: devin-ai-integration[bot] <158243242+devin-ai-integration[bot]@users.noreply.github.com>