BREAKING CHANGE(core): Refactor to v3: introduce modular core/domain architecture, plugin system, observability and strict TypeScript configuration; remove legacy classes

ts/core/observability/index.ts

@@ -0,0 +1,14 @@
+/**
+ * Observability layer for Elasticsearch client
+ *
+ * This module provides:
+ * - Structured logging with context and correlation
+ * - Prometheus-compatible metrics collection
+ * - Distributed tracing with OpenTelemetry-compatible API
+ *
+ * @packageDocumentation
+ */
+
+export * from './logger.js';
+export * from './metrics.js';
+export * from './tracing.js';