Proving once again that any youngish woman can get into hot-bod shape after having a kid if she sets her mind to it, Maggie Gyllenhaal is the new visual spokesperson for a just-launched promotional campaign Agent Provocateur, the London-based lingerie firm. It’s a semi-legit item (MCN is running it), but the things this column will do to attract readers. The first TIFF press screening starts 85 minutes from now…