维护者确认: #2095 fix(desktop): serialize Orca team shutdown with sends

PR [#2095](https://github.com/makecindy/cindy/pull/2095) 触发维护者确认门。

**触发原因:**
- rules: rules-change（改到规则文档）
- arch: core-paths（核心路径改动 ≥ 150 行）

**改动概述:** 序列化 Orca team shutdown 与消息发送，避免竞态条件。

**确认方式:** 维护者在 PR 上 Approve 即通过；需要修改就 Request Changes，作者改完后重新 Approve 即放行。

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关联 PR:#2095(作者 @mengfanyu9410-hub);本 issue 由 review-pr 流程自动创建,用于先讨论该 PR 涉及的审查规则文档变更,维护者确认后 PR 会恢复推进。

Review PR #2095 and the rules documentation changes it triggered. Check whether a maintainer has approved the PR; completion is an approval or a requested-change cycle followed by a new approval. The issue itself does not identify a file or test to run.

Written by the indexing model from the issue text.