docs: add CHANGELOG.md with release history (#4713)

Author: dashitongzhi

CHANGELOG.md

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+# Changelog
+
+All notable changes to Spring AI Alibaba are documented in this file.
+
+The format is loosely based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+> For full release notes and downloadable artifacts, see the
+> [GitHub Releases](https://github.com/alibaba/spring-ai-alibaba/releases) page.
+
+## [Unreleased]
+
+### Added
+- Placeholder section. New changes will be listed here before the next release.
+
+## [1.1.2.2] - 2026-03-10
+
+### Added
+- **AgentScope integration** — `AgentScopeAgent` wraps [AgentScope ReActAgent](https://github.com/agentscope-ai/agentscope-java)
+  as a `BaseAgent` for use in graph workflows (`spring-ai-alibaba-starter-agentscope`).
+- **Multiagent patterns** under `examples/multiagent-patterns/`:
+  Subagent, Supervisor, Skills, Routing (simple and graph variants),
+  Handoffs (single- and multi-agent), and Workflow.
+- **Voice Agent** example — sandwich architecture (STT → ReactAgent → TTS)
+  with WebSocket streaming, DashScope ASR and CosyVoice TTS.
+- **Multimodal agent** examples (image understanding, audio input).
+
+### Changed
+- Default agent configuration refinements for graph-based workflows.
+- Updated documentation portal at <https://java2ai.com/docs/overview>.
+
+## [1.1.2.1] - 2026-03-09
+
+### Fixed
+- Patch release addressing regressions introduced in 1.1.2.0.
+
+## [1.1.2.0] - 2026-02-02
+
+### Added
+- Enhancements to the Agent Graph core, including additional node types
+  and improved reactive stream handling.
+- New starters and example modules.
+
+## [1.1.0.0] - 2025-12-30
+
+### Added
+- First stable release of the 1.1.x line, built on
+  [Spring AI 1.1.0](https://github.com/spring-projects/spring-ai/releases/tag/v1.1.0)
+  and [Spring AI Alibaba Extensions 1.1.0.0](https://github.com/spring-ai-alibaba/spring-ai-extensions/releases/tag/v1.1.0.0).
+- Production-ready Agent Graph runtime with comprehensive documentation
+  available at <https://java2ai.com/docs/overview>.
+
+### Changed
+- Aligned public APIs with Spring AI 1.1.0.
+
+## [1.0.0.4] - 2025-09-25
+
+### Added
+- **Rebuilt Agent Graph Engine** — refactored core Agent API; shifted to
+  a Flux-based reactive stream architecture.
+- **Agent-to-Agent (A2A) communication** — A2A client/server with
+  Nacos integration for remote agent discovery.
+- Bumped to Spring AI 1.0.1 with widespread stability fixes.
+
+## [1.0.0.3] - 2025-08-14
+
+### Fixed
+- Stability and compatibility fixes on top of 1.0.0.x.
+
+## [1.0.0.2] - 2025-05-29
+
+### Fixed
+- Early production fixes following the 1.0.0 GA release.
+
+## Earlier releases
+
+See [GitHub Releases](https://github.com/alibaba/spring-ai-alibaba/releases)
+for the full history, including 1.1.0.0-RC1, 1.1.0.0-M5, 1.1.0.0-M4, 1.0.0.1, and 1.0.0.0.
+
+[Unreleased]: https://github.com/alibaba/spring-ai-alibaba/compare/v1.1.2.2...HEAD
+[1.1.2.2]: https://github.com/alibaba/spring-ai-alibaba/releases/tag/v1.1.2.2
+[1.1.2.1]: https://github.com/alibaba/spring-ai-alibaba/releases/tag/v1.1.2.1
+[1.1.2.0]: https://github.com/alibaba/spring-ai-alibaba/releases/tag/v1.1.2.0
+[1.1.0.0]: https://github.com/alibaba/spring-ai-alibaba/releases/tag/v1.1.0.0
+[1.0.0.4]: https://github.com/alibaba/spring-ai-alibaba/releases/tag/v1.0.0.4
+[1.0.0.3]: https://github.com/alibaba/spring-ai-alibaba/releases/tag/v1.0.0.3
+[1.0.0.2]: https://github.com/alibaba/spring-ai-alibaba/releases/tag/v1.0.0.2