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Plans 05-01..05-08 cover all CLOUD-01..07 requirements plus SEC-09 (cloud credential cleanup on account deletion). Key design decisions: API layer owns D-05 token refresh + DB update via _call_cloud_op helper; backends are stateless signal-raisers. Vitest tests added for frontend store and SettingsCloudTab. RESEARCH.md open questions resolved. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>