test(rmcp): retain settlement write authority

[BleedingDev]

Summary

• retain the registered global-database test runtime for the full broker fixture lifetime
• preserve daemon settlement write authority until asynchronous delivery completes
• leave production transport behavior unchanged

Why

The fixture kept only the database lease. The registered runtime that owns daemon write scope was dropped before asynchronous settlement, so delivery tests could strand attempts despite exercising valid production behavior.

Verification

• successful response settlement passes
• peer-disconnect dropped settlement passes
• client-cancellation dropped settlement passes
• aggregate focused suite: 14 passed
• Rustfmt and diff checks pass

Supports #707.

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Latest commit: b046970

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[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 2026-08-30T15:31:48.605058Z	b046970	PR opened

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