Desktop Client: MVP Electron window + process supervisor

[messiwu]

Parent

#112 — PRD: macOS Desktop Client (Electron, Intel x64 v1)

What to build

Add the Desktop Client workspace package and a minimal Electron shell that completes the first demoable vertical slice: launch app → embedded local server starts on a dynamic loopback port → BrowserWindow shows the same entry view as the browser product → quit cleans up the server process.

v1 native chrome is minimal: Dock icon, application menu with About and Quit, standard window close behavior (document whether close equals quit).

Developer workflow: a package script runs Electron against the standalone server (system Node acceptable for this slice; bundled Node comes in the release pipeline slice).

Update workspace guard rules to admit the new package without violating root harness constraints.

Acceptance criteria

• New Desktop Client workspace package registered in the pnpm workspace
• Repository guard script passes with the new package layout
• Double-clicking / running the dev Desktop Client script opens the editor entry view over loopback
• No file:// loading of the Next app
• Quitting the app terminates the embedded Node server (no orphan process)
• Integration test on the process supervisor: server ready within timeout, /api/agents returns success, port released after stop
• About and Quit menu items work on macOS

Blocked by

• Desktop Client: standalone production server + e2e parity seam #113

[lefarcen]

Hey @messiwu, thanks for breaking this out from #112 — the vertical slice is scoped clearly, especially the loopback-only BrowserWindow requirement and the shutdown/no-orphan-process acceptance checks.

I've tagged this as an enhancement. Since it's blocked by #113, the next useful seam is getting the standalone production server in place first so the Electron shell can stay thin around a proven loopback target. Once that lands, this issue has a clean boundary for the window + supervisor slice.