G30 -- A guard that is downstream, or not running, is not a guard; unattended lanes leave evidence

A check that sits below the failure it should stop is not a guard; a guard that predates the process it should stop is not running. A lane that runs unattended leaves progress evidence (an empty log and no process means it never started); a number that will decide something is written to a file another process can read at any moment. provenance: BFM R54 + R55; the harness wounds of P31 S58