A family of Russian asylum-seekers was released from a South Texas immigrant detention center on Wednesday after more than four months in custody — an ordeal they say left the children anxious, sickened and afraid. Nikita, his wife, Oksana, and their three children had been held since October at the Dilley Immigration Processing Center, where they said they endured worms and mold in their food, hourslong waits for medicine and restless nights under lights that never fully dimmed. “Thank God,”