document release changes

Author: UsmanovMahmudkhan

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## 2.0.0-SNAPSHOT - 2026-06-07
+
+- Converted the project to a multi-module enterprise architecture.
+- Added OIDC/JWT authentication with multiple approved issuers.
+- Added tenant RBAC, room authorization, PostgreSQL persistence, durable
+  outbox/replay, Redis coordination, distributed limits, retention, legal
+  holds, audited management APIs, metrics, OCI packaging, and Helm deployment.
+- Kept v1 demo endpoint disabled by default.
+
+## 1.0.0 - 2026-06-07
+
+- Added Jakarta WebSocket room-based chat endpoint.
+- Added thread-safe in-memory room and session management.
+- Added Jackson JSON protocol, validation, and safe browser test client.
+- Added unit tests and Maven Central publishing configuration.