Persist the conversation knowledge retrieval mode across restarts so timed messages use the saved setting. Clarify shared conversation authorization in the scheduled-task documentation and correct the renderer test query type.
Validation: 374 focused tests passed; typecheck and lint passed. The full suite had two failures that passed on focused reruns. Real remote validation remains blocked by the temporary harness SDK module loading error; no model requests were made.
Release note: 修复会话知识检索模式在重启后丢失的问题，定时消息继续使用会话保存的检索设置，并同步任务授权说明。
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