statusFrom method
Maps a statusStepFor probe's outcome to a status.
The default reads a zero exit as running and anything else as stopped,
which is what a well-behaved … info or … is-active probe reports.
Override where a tool distinguishes "not running" from "broken".
Implementation
FormulaStatus statusFrom(ExecResult result) =>
result.ok ? FormulaStatus.running : FormulaStatus.stopped;