维护者确认: #2924 fix(desktop): restore discounted Codex route for native spawn_agent

PR [#2924](https://github.com/makecindy/cindy/pull/2924) 触发了维护者确认门。

**触发类别**: arch (core-paths: 核心路径改动 347 行 ≥ 150)

**涉及路径**: apps/desktop/src/main/maker-host/ 下 Codex 代理主机与子 agent 配置

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

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关联 PR:#2924(作者 @zhaoyiming1-source);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,维护者确认后 PR 会恢复推进。

This issue is a maintainer-confirmation gate for PR #2924, not a standalone change. Read the PR and the Codex agent-host and child-agent configuration under apps/desktop/src/main/maker-host/; completion is maintainer approval or requested changes followed by re-approval.

Written by the indexing model from the issue text.