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4a6eb0b16d
Move fd_, closed_, and loop_monitored_ fields from BSD/LWIP socket implementations to the base Socket class. Since only one socket implementation is active per build, these can be non-virtual. Make Socket::ready() and get_fd() non-virtual, eliminating vtable dispatch on every main loop iteration. Inline is_socket_ready via friendship for the fast path while keeping the public API with bounds checking for external callers. Saves ~316 bytes of flash on ESP32-IDF builds.
