fix: 循环检测按工具名+参数比较，避免把检索扇出误判为循环 - #472
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RuleAgentTraceLoopDetection 只比较工具名序列，因此一次检索扇出（同一个 WebSearch、八个不同 query）与卡死循环无法区分：n-gram 会把它读成 ['WebSearch','WebSearch'] 重复 4 次并判为循环。 改为在"工具名 + 参数指纹"的签名序列上做 n-gram：参数不同则签名不同，扇出 不再触发；同一调用反复重试仍会被检出。没有参数的调用退回按名比较，旧行为 不变。参数键兼容 args / arguments / tool_input / input。 reason 仍按工具名展示（pattern ['Read','Read']），不暴露内部指纹。 Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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RuleAgentTraceLoopDetection 只比较工具名序列，因此一次检索扇出（同一个
WebSearch、八个不同 query）与卡死循环无法区分：n-gram 会把它读成
['WebSearch','WebSearch'] 重复 4 次并判为循环。
改为在"工具名 + 参数指纹"的签名序列上做 n-gram：参数不同则签名不同，扇出
不再触发；同一调用反复重试仍会被检出。没有参数的调用退回按名比较，旧行为
不变。参数键兼容 args / arguments / tool_input / input。
reason 仍按工具名展示（pattern ['Read','Read']），不暴露内部指纹。