Normalize fieldset legend text same as getLabel (dedup, strip Required)

Legend text was saved to answers.json with duplicated text and "Required"
suffix, causing pattern mismatches on future runs.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

lib/form_filler.mjs

@@ -411,7 +411,16 @@ Answer:`;
 
     // Fieldsets (radios and checkbox groups)
     for (const fs of await container.$$('fieldset')) {
-      const leg = await fs.$eval('legend', el => el.textContent.trim()).catch(() => '');
+      const leg = await fs.$eval('legend', el => {
+        let raw = (el.textContent || '').replace(/\s+/g, ' ').replace(/\s*\*\s*$/, '').replace(/\s*Required\s*$/i, '').trim();
+        if (raw.length > 8) {
+          for (let len = Math.ceil(raw.length / 2); len >= 4; len--) {
+            const candidate = raw.slice(0, len);
+            if (raw.startsWith(candidate + candidate)) { raw = candidate.trim(); break; }
+          }
+        }
+        return raw;
+      }).catch(() => '');
       if (!leg) continue;
       const anyChecked = await fs.$('input:checked');
       if (anyChecked) continue;