BREAKING CHANGE(docs): Update documentation and examples to unify async and sync assertions, add custom matcher guides, and update package configuration

package.json

@@ -62,5 +62,6 @@
     "onlyBuiltDependencies": [
       "mongodb-memory-server"
     ]
-  }
+  },
+  "packageManager": "pnpm@10.7.0+sha512.6b865ad4b62a1d9842b61d674a393903b871d9244954f652b8842c2b553c72176b278f64c463e52d40fff8aba385c235c8c9ecf5cc7de4fd78b8bb6d49633ab6"
 }