“It’s ‘Cowboy Bebop,’ let’s not f— this up.” That was the guiding mantra for showrunner and executive producer André Nemec and the cast and crew of Netflix’s live-action adaptation of the beloved anime series, which hit the streamer Friday. Spike Spiegel and Faye Valentine in “Cowboy Bebop.” Part of Faye’s anime backstory involves her being romanced by a con man …