evaluateA2uiChecks

Evaluates every component's checks against the surface's current data model and returns the first failing rule of each component, in component order. A rule passes only when its condition resolves to true, as resolveA2uiValue resolves it. A TextField's validationRegexp on a bound value counts as one more rule with the message "Invalid format". A component inside a child template is evaluated once per list item, after the others, and its failure carries that item's basePath. Nothing is stored or sent.