Timmy Failure: Mistakes Were Made,” a family comedy that premiered on Disney+ last year that you almost certainly didn’t see. And for his follow-up to that film, the man with the least predictable career in Hollywood came up with “Stillwater,” a genre-agnostic semi-thriller that was greeted with cheers and applause at its well-received Cannes Film Festival premiere on Thursday.Neatly mirroring its director’s style and signature, “Stillwater” is nigh impossible to pin down, taking the broad