Function observe_step 

pub fn observe_step(
    program: &str,
    args: &[&str],
    directory: &Path,
) -> Result<bool, CliError>

Like run_step, but reports success as a bool instead of aborting — used by the multi-part verdicts (frame test, frame check) that run every scope before judging.

Errors

Still fails hard when the command cannot start at all: a missing binary is an environment refusal, not a scope verdict.