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Core skill for @suspensive/react: Suspense (clientOnly prop), ErrorBoundary (fallback, shouldCatch, resetKeys, onError, onReset), ErrorBoundaryGroup, Delay, ClientOnly, useIsClient, useErrorBoundary, useErrorBoundaryFallbackProps, DefaultPropsProvider/DefaultProps, lazy/createLazy/reloadOnError, and the shared .with() HOC pattern. Load when code imports '@suspensive/react' or needs declarative Suspense boundaries, error boundaries, loading fallbacks, or client-only rendering in React 18+.