技术架构讨论：PR #832 fix(maker-core): 修复 Codex 停止后的假忙状态

## 触发原因

PR #832 命中技术架构变更门：修改 maker-core 的 Codex 状态管理逻辑，属于较大的架构调整。

## 需要确认

请架构放行人确认：
1. 状态修复逻辑是否影响其他 worker 类型或其他状态流转
2. 是否存在竞态或时序相关的边界情况
3. 改动是否需要对应的测试覆盖

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*由 review-pr 流程自动创建 · 关联 PR: #832*

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关联 PR:#832(作者 @Chener);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 #832 and its changes to maker-core's Codex state-management logic. Check the listed effects on other worker types, state transitions, and race or timing edge cases; done means the architecture review questions are resolved and any required test coverage is identified.

Written by the indexing model from the issue text.