Function default_classify_runtime 

pub fn default_classify_runtime(
    node_id: &str,
    generation: u32,
    invocation: &SmokeInvocation,
    exit_success: bool,
    output: &str,
) -> Vec<ResidualEvent>

Default classification shared by adapters: a smoke invocation fails when it exits non-zero (and failure_on_nonzero) or its output carries a crash marker. Returns at most one residual per invocation.