pub const NO_RENDER_THREAD_VAR: &str = "FRUST_NO_RENDER_THREAD";Expand description
The render-thread-split kill-switch environment/compile-time variable: when
set to any non-"0" value, render_thread_enabled is false and a shell
keeps the pre-split single-thread frame path.
Parsed exactly like crate::frame_gate::NO_FRAME_GATE_VAR — either the
compile-time --define or the runtime process env engages it.