Function apply_lambda_data 

pub fn apply_lambda_data(
    lambda_name: &str,
    target: &str,
    ctx: &DispatchCtx,
) -> String

Apply a named ΛD (lambda data structure) to a target. OSS default: resolves target through ctx.let_bindings (literal if missing) + returns canonical "lambda:<name>(<resolved_target>)". Enterprise overrides hook the Fase 15 CPS dispatcher (real lambda evaluation against the IR).