By: Ammar Nanjiani <ammar.nanjiani@gmail.com>
fix(nix): auto-accept flake nixConfig to unblock direnv nix-direnv evaluates the flake with no TTY, so nix's interactive 'do you want to allow extra-substituters' prompt can never be answered and the devshell hangs. Set accept-flake-config globally; the flake's caches are already mirrored in nix.settings substituters.