“A lot of the book business is timing,” editor Buzz Poole remarked Monday night. If that’s true, the launch party for CBGB: Decades of Graffiti represented some kind of weird cosmic collision. On one side of a wall, in CB’s 313 Gallery, ex-Voidoid (and novelist) Richard Hell, who penned the introduction, held court for friends and book-buyers and for the camera crew that’s been following him around for a week. On the other side, in the original CBGB, legendary hardcore act Bad Brains was warming up for a blistering reunion set.Through what Hell calls the “stunning and stunningly effective inertia” of club owner Hilly Kristal, CBGB has lately become a kind of meta-club: both itself and a tribute to itself. This week, Mark Batty Publisher releases a handsome document of the CBGB’s densely inked walls; next week, rumor has it, those walls get dismantled and shipped to Vegas, where Kristal plans to reopen the dump. Punk is dead. Long live punk.