ci: 校准 Source → Sessions 两层交互

[makoMakoGo]

临时草稿 PR，仅用于在 GitHub Actions 中编译、Lint 和测试 #154 的 Sessions 两层导航实现。验证后的代码会压成一个正式语义提交写回 #154；本 PR 不会合并。

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[codspeed-hq]

Merging this PR will not alter performance

✅ 27 untouched benchmarks

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_{Comparing codex/issue-153-session-navigation (a312c17) with personal/local-clients (48cf8bb)¹}

Footnotes

1. No successful run was found on personal/local-clients (7647c2f) during the generation of this report, so 48cf8bb was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩