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* test: add comprehensive tests for message event handling - Add AstrMessageEvent unit tests (688 lines) - Add AstrBotMessage unit tests - Enhance smoke tests with message event scenarios Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * fix: improve message type handling and add defensive tests --------- Co-authored-by: whatevertogo <whatevertogo@users.noreply.github.com> Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>