feat: add TypeScript typecheck\

package.json

@@ -25,7 +25,8 @@
     "setup": "bash ./scripts/setup.sh",
     "lint": "biome check .",
     "lint:fix": "biome check . --fix",
-    "format": "biome format . --write"
+    "format": "biome format . --write",
+    "typecheck": "tsc --noEmit"
   },
   "dependencies": {
     "chalk": "^5.3.0",
@@ -35,7 +36,8 @@
   "devDependencies": {
     "@biomejs/biome": "^2.4.8",
     "@types/bun": "^1.3.10",
-    "@types/node": "^25.5.0"
+    "@types/node": "^25.5.0",
+    "typescript": "^5.9.3"
   },
   "keywords": [
     "opencode",