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Electron app AGENTS.md

AGENTS.md for Electron desktop apps (Electron Forge or electron-vite): process layout, IPC contracts, and release safety.

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# AGENTS.md: Electron app

## Commands
`npm run dev` · `npm test` · `npm run lint` · `npm run typecheck` · package: `npm run make` (don't publish)

## Layout
- `src/main/` (Node, privileged), `src/preload/` (bridge), `src/renderer/` (web UI, unprivileged), `src/shared/` (types and IPC channel names).
- Renderer code may not import `electron`, `fs`, or other Node modules. If it needs something, add a typed method to the preload API and a handler in main.

## IPC contract
- Each channel is defined once in `src/shared/ipc.ts` with request/response types.
- Main: `ipcMain.handle(CHANNEL, handler)`; handlers validate input (zod) and return plain serializable data.
- Preload: `contextBridge.exposeInMainWorld('api', { getSettings: () => ipcRenderer.invoke(...) })` and a matching `window.api` type declaration.

## Security (keep these on)
- `contextIsolation`, `sandbox`, no `nodeIntegration`, strict CSP, navigation and `window.open` blocked except allowlisted URLs.
- Never load remote code into a window with preload access.

## Native and files
- Use `app.getPath('userData')` for app data; never write next to the executable.
- Native modules must be rebuilt for Electron (`@electron/rebuild` or the bundler plugin).

## Don't
- Don't bump the Electron major, change signing/notarization config, or publish releases without approval.

## Done
Typecheck, lint and tests pass; the packaged app launches and the changed flow works.