Apply review nitpicks for constructor docs, response invariant, and logout test

[koder95]

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[coderabbitai]

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Review skipped

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⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 1205e36c-d496-441c-8682-e4077bdf8ac1

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/split-requesthandler-into-three-interfaces-r8tv3n

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