test: add Node test suite and pre-commit hook

package.json

@@ -5,12 +5,16 @@
   "devDependencies": {
     "@opencode-ai/plugin": "*",
     "@types/node": "*",
+    "husky": "^9.1.7",
     "typescript": "*"
   },
   "dependencies": {
     "envsitter": "*"
   },
   "scripts": {
-    "typecheck": "tsc -p tsconfig.json"
+    "typecheck": "tsc -p tsconfig.json",
+    "build:test": "tsc -p tsconfig.test.json",
+    "test": "npm run build:test && node --test dist-test/test/*.test.js",
+    "prepare": "husky"
   }
 }