Function explicit_ui_binary 

pub fn explicit_ui_binary(path: &Path) -> Result<PathBuf>

A UI binary the caller named (SuiteOptions::ui_binary, --ui-binary, RIGHTKIT_QA_UI_BINARY). It skips the resolver’s checks (name, release directory, QA marker: the caller said which file), but the installed-app refusal stays in force (Orthic-Labs/rightkit#235), so the suite fails before any scenario starts instead of at the first ui_launch.