chore(architecture): enforce layer boundaries

package.json

@@ -6,7 +6,8 @@
   "scripts": {
     "dev": "bun --hot index.ts",
     "start": "NODE_ENV=production bun index.ts",
-    "build": "bun run build.ts"
+    "build": "bun run build.ts",
+    "lint": "eslint ."
   },
   "dependencies": {
     "@radix-ui/react-slot": "^1.2.3",
@@ -19,9 +20,12 @@
     "tw-animate-css": "^1.4.0"
   },
   "devDependencies": {
+    "@eslint/js": "^10.0.1",
+    "@types/bun": "latest",
     "@types/react": "^19",
     "@types/react-dom": "^19",
-    "@types/bun": "latest",
-    "tailwindcss": "^4.1.11"
+    "eslint": "^10.6.0",
+    "tailwindcss": "^4.1.11",
+    "typescript-eslint": "^8.62.1"
   }
 }