configThinkingLevels top-level constant
The rungs a config surface (issue #734: FA_PROVIDER_CONFIG, roles:
chain entries) may declare: the ladder plus xhigh/max, which fold to
high exactly like clampThinkingLevel — forward-compatible like pi.
This list's order IS the error-message order.
Implementation
const List<String> configThinkingLevels = [
'minimal',
'low',
'medium',
'high',
'xhigh',
'max',
];