Constant ENV_NO_TUI 

pub const ENV_NO_TUI: &str = "DEV_PRUNE_NO_TUI";

Set to any value to keep every full-screen view from opening, so the line-by-line fallback runs instead.

For agents and wrappers that hold a real terminal — the terminal test alone cannot tell them apart from a person, and a full-screen view waiting on a keypress from something that will never send one is a hang.