A giant hamster appears out of nowhere to prod at an addict's struggles. A wrestler with signs of CTE grapples with action figures to prod at his demons. A long-haired fantasy warrior... well, I kinda don't wanna tell you what the long-haired fantasy warrior does. Part of the fun of Room 104, Mark and Jay Duplass' episodic anthology series for HBO, is seeing how each initial premise gets modified, twisted, and turned into something much more experimentally engaging. Its fourth and final season just might be the show's most ambitious, surreal season yet, as the …