added tsconfig.build

tsconfig.build.json

@@ -0,0 +1,12 @@
+// tsconfig.build.json
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "types": ["node"],          // ✅ no vitest here
+    "declaration": true,
+    "declarationDir": "dist",
+    "emitDeclarationOnly": false,
+    "sourceMap": true
+  },
+  "exclude": ["src/test/*"]
+}