Gray skies emptied streams of rain onto an encampment at Castro and Hensley Streets on a cold January night. Untarred paths turned muddy and flooded fast, but the rain didn’t stay on the streets. It seeped into immobile recreational vehicles from all sides, splattering through frames where glass windows once were. While it rained, 43-year-old O’Neill Fernandez was busy lending a hand to those with leaking RVs. Fernandez, who works with the nonprofit Safe Organized Spaces, tried to drape tarpaulins…