Initial scaffold: pnpm workspace monorepo with backend + frontend

- Backend: Express + WebSocket proxy (tsx watch, strict TS, ESM)
- Frontend: React 19 + Vite + Monaco + Tailwind v4 + Tauri v2
- pnpm workspace at root for single-install workflow
- AGENTS.md with architectural constraints and commands
- Removed Tauri greet demo, added minimal App shell
- No external database, Git-as-Database philosophy

typst-leaf-backend/package.json

@@ -0,0 +1,30 @@
+{
+  "name": "typst-leaf-backend",
+  "version": "1.0.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "tsx watch src/index.ts",
+    "build": "tsc",
+    "start": "node dist/index.js",
+    "typecheck": "tsc --noEmit",
+    "test": "echo \"Error: no test specified\""
+  },
+  "dependencies": {
+    "cors": "^2.8.5",
+    "execa": "^9.6.1",
+    "express": "^4.22.2",
+    "simple-git": "^3.27.0",
+    "ws": "^8.18.2",
+    "zod": "^3.24.5"
+  },
+  "devDependencies": {
+    "@types/cors": "^2.8.17",
+    "@types/express": "^4.17.25",
+    "@types/node": "^22.15.17",
+    "@types/ws": "^8.18.1",
+    "tsx": "^4.19.4",
+    "typescript": "~5.8.3"
+  },
+  "packageManager": "pnpm@10.23.0"
+}

typst-leaf-backend/src/index.ts

@@ -0,0 +1,27 @@
+import { createServer } from "http";
+import { WebSocketServer } from "ws";
+
+const PORT = Number(process.env.PORT) || 4000;
+
+const server = createServer((_req, res) => {
+  res.writeHead(200, { "Content-Type": "application/json" });
+  res.end(JSON.stringify({ status: "ok", service: "typst-leaf-backend" }));
+});
+
+const wss = new WebSocketServer({ server });
+
+wss.on("connection", (ws) => {
+  console.log("WebSocket client connected");
+
+  ws.on("message", (data) => {
+    console.log("Received:", data.toString());
+  });
+
+  ws.on("close", () => {
+    console.log("WebSocket client disconnected");
+  });
+});
+
+server.listen(PORT, () => {
+  console.log(`Backend running on http://localhost:${PORT}`);
+});

typst-leaf-backend/tsconfig.json

@@ -0,0 +1,21 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "outDir": "dist",
+    "rootDir": "src",
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "resolveJsonModule": true,
+    "declaration": true,
+    "declarationMap": true,
+    "sourceMap": true,
+    "noUncheckedIndexedAccess": true,
+    "noEmit": false
+  },
+  "include": ["src/**/*"],
+  "exclude": ["node_modules", "dist"]
+}