Ethan Hawke’s Wildcat opens, very nearly, with a familiar scenario: a dispiriting encounter between a young artist with an exacting creative vision and a conventional corporate gatekeeper with a checklist approach to what sells. The scene depicts a real-life exchange between 24-year-old Mary Flannery O’Connor (played by Maya Hawke, the director’s daughter) and her editor at Holt Rinehart regarding her unfinished novel Wise Blood…