May we all be lucky enough to have a partner who hypes us up like Jason Ritter does for Melanie Lynskey. “Melanie is just so fun to work with,” Ritter, 46 — who’s shared the screen with Lynskey, 48, on multiple occasions — revealed exclusively in the latest issue of Us Weekly, on newsstands now. “She’s so brilliant. She is so funny. Every take is different. She’s the kind of actor who makes your job easier, because you just have to watch her and…