fix: ensure node shebang is preserved in dev binary

packages/cli/package.json

@@ -10,7 +10,7 @@
     "mintel": "./dist/index.js"
   },
   "scripts": {
-    "build": "tsup src/index.ts --format esm --target es2020",
+    "build": "tsup",
     "start": "node dist/index.js",
     "dev": "tsup src/index.ts --format esm --watch --target es2020",
     "test": "vitest run"
@@ -28,4 +28,4 @@
     "@types/prompts": "^2.4.4",
     "@mintel/tsconfig": "workspace:*"
   }
-}
+}

packages/cli/tsup.config.ts

@@ -0,0 +1,11 @@
+import { defineConfig } from 'tsup';
+
+export default defineConfig({
+    entry: ['src/index.ts'],
+    format: ['esm'],
+    target: 'es2020',
+    clean: true,
+    banner: {
+        js: '#!/usr/bin/env node',
+    },
+});