Initial commit

lib/core/domain/errors.dart

@@ -0,0 +1,13 @@
+import '../contracts/error.dart';
+
+class DomainError implements Exception {
+  final ErrorCode code;
+  final String message;
+  final bool retryable;
+  final Object? details;
+
+  DomainError(this.code, this.message, {this.retryable = false, this.details});
+
+  @override
+  String toString() => 'DomainError(${code.value}): $message';
+}