chore: bump version to 0.2.0

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: DDU1222

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "wechat-agent-sdk"
-version = "0.1.2"
+version = "0.2.0"
 description = "WeChat AI Agent SDK with ACP (Agent Client Protocol) support"
 readme = "README.md"
 requires-python = ">=3.11"