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B14 根因: 记忆按 agent_id 隔离存储，用户换对话/Agent 后 新 agent_id scope 下无记忆可检索，导致"我叫什么"无法召回。 修复: retrieve_broad_identity 在当前 agent 无结果时 fallback 到 retrieve_by_scope_any_agent，跨所有 agent 检索身份相关 的 preference/knowledge 记忆（用户名、工作单位等）。 影响范围: 仅 IdentityRecall 路径（"我是谁"/"我叫什么"类查询）， 普通 keyword 检索仍按 agent_id scope 隔离。