refactor(fleet): extract relay-fleet.js helper cluster

[sungjunlee]

Summary

One seam extract.

Closes #1332

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-05T12:31:49.531394Z	80a1381	PR opened

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