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Chooses between UI-coupled mutations and explicit HTTP contracts without treating either as a hidden trust boundary.
Chooses post-paint synchronization by default and reserves layout effects for pre-paint measurement or correction.
Layers optimistic routing checks with secure data-layer authorization across components, actions, and handlers.
Defines a coherent subscription and snapshot contract for state owned outside React, including server rendering.
Uses development-only repeated rendering, Effects, and ref callbacks to expose impurity and missing cleanup.
Explains how to choose an E2E flow, control test data, avoid brittleness, and cover frontend/API integration risk.