FieldSanitizer output can fail validateSubset: only [_-] is stripped

Il problema si trova nello stripCharsRegex di FieldSanitizer in registry/conventions/sanitization.jsonld. Confronta la sua attuale rimozione di solo [_-] con il pattern del validatore ^[a-zA-Z0-9]+$ in validateSubset. Esamina le funzioni sanitizeNameUnique e sanitizeAnswerCode. La correzione probabilmente comporta l'espansione dell'espressione regolare per rimuovere caratteri non alfanumerici e possibilmente l'aggiunta della traslitterazione per umlaut e ß. Testa eseguendo il sanitizer esistente sugli esempi nella tabella e verificando l'output rispetto al validatore.

FieldSanitizer strips only [_-] (stripCharsRegex in registry/conventions/sanitization.jsonld), but validateSubset requires names and answer codes to match ^[a-zA-Z0-9]+$. So a sanitized name or code can still be rejected by the validator from the same registry.

v0.1.2 (sanitization.jsonld unchanged on main):

How it showed up: formulaid sanitizes generated questionnaires with FieldSanitizer before validating them (formulaid#17). In a real run, a German model produced aktivitätshäufigkeit and täglich. Both passed through the sanitizer, failed the validator, and sent the run into repair rounds that didn't fix them. formulaid now transliterates to ASCII before calling the sanitizer (formulaid 0ba209e), but the converters use the same sanitizer and have the same gap.

Expected: the sanitizer's output always satisfies the validator's pattern. For example, transliterate umlauts and ß (ä→ae, ß→ss), then strip everything outside [a-zA-Z0-9], not just [_-].