Function run_doctor 

fn run_doctor(
    agent: Option<String>,
    profile: Option<String>,
    repo: Option<OsString>,
    json: bool,
) -> Result<i32>

SP5c design §3-§4: every check runs and prints; the exit code is 5 when any record failed. A working directory that cannot be read is not an error here: discovering . then yields the repository record.