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* fix: 修改 register_agent 以避免运行时导入 AstrAgentContext * test: improve register_agent test robustness - Add fixture for llm_tools cleanup to avoid test interference - Use multiple import patterns to make guard more robust to refactors - Add assertion to verify decorated coroutine is wired as handoff handler Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> * 删除测试文件: 移除 register_agent 装饰器的运行时行为测试 --------- Co-authored-by: whatevertogo <whatevertogo@users.noreply.github.com> Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com> Co-authored-by: Soulter <905617992@qq.com>