技术架构讨论：PR #531 scheduler 防止启动时重新认领活跃任务

### 关联 PR

#531 fix(scheduler): prevent startup re-arm of live claims

### 为什么需要讨论

该 PR 修改幅度较大（3986 行 diff，791 行核心路径），涉及 scheduler 核心逻辑重构，需要技术白名单成员确认架构合理性。

请技术白名单成员确认后在本 issue 或 PR 评论区留言同意。

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关联 PR:#531(作者 @ag-linden);本 issue 由 review-pr 流程自动创建,用于先讨论该 PR 涉及的技术架构调整,聊清楚后 PR 会恢复审查。

Start by reading PR #531, which contains the proposed scheduler core-logic refactor for preventing startup re-arming of live claims. Review the architecture and the 3,986-line diff; done means a technical whitelist member confirms the design in this issue or the PR comments.

Written by the indexing model from the issue text.