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4 tipos en frontend/types/core/: FetchState, MutationState, FormState, APIClientConfig. 9 funciones en frontend/functions/core/: api_client, http_cache, use_fetch, use_mutation, use_infinite_scroll, use_form, use_debounced_search, use_sse, use_websocket. Zero dependencias externas — solo React + fetch nativo. Cache in-memory con SWR. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>