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Cliente Server-Sent Events C++ reusable (fn_sse::Client) con background thread, exponential backoff, Last-Event-ID y stop() que no bloquea. Implementacion clave: fork+execvp curl directamente (sin /bin/sh wrapper) para tener el PID real del proceso curl en curl_pid_, lo que permite que stop() → kill(SIGTERM) → fgets NULL → join() funcione sin bloqueo. 4 tests (Catch2): connect_and_receive_3_events, parse_event_field, reconnect_on_disconnect, stop_kills_thread. Fixture Python SSE con /health probe via http_request_cpp_core. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>