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评审建议(Task4 code-quality): - start 已启动则不重复建 client(避免泄漏旧连接池) - 关停只发一批、超出丢弃,补注释说明 best-effort - 补测: _run_loop 失败后存活 / stop drain+发最后一批+关 client Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>