Photo: Focus Features/Talking Fish Pictures There is a moment at the very end of Dìdi , director Sean Wang’s feature debut , where it becomes clear that the film you’ve just seen is so much more than the story of one 13-year-old’s coming of age in Fremont, California. Chris (Izaac Wang) and his mother Chungsing (Joan Chen) sit across from each other at their kitchen table. Chris is eating an after-school snack his mother has prepared as she watches him, her face beaming with pure love, eyes