fix: report unfilled required selects as unknown fields

Non-EEO required selects with no answer were silently ignored, causing
infinite loops when LinkedIn blocked page advancement. Now reported as
unknown fields so the applier can exit with needs_answer status.

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

lib/form_filler.mjs

@@ -297,7 +297,6 @@ export class FormFiller {
         const ll = lbl.toLowerCase();
         if (ll.includes('race') || ll.includes('ethnicity') || ll.includes('gender') ||
             ll.includes('veteran') || ll.includes('disability') || ll.includes('identification')) {
-          // Iterate options to find a "prefer not" variant — selectOption doesn't accept regex
           const opts = await sel.$$('option');
           for (const opt of opts) {
             const text = await opt.textContent().catch(() => '');
@@ -306,6 +305,9 @@ export class FormFiller {
               break;
             }
           }
+        } else if (await this.isRequired(sel)) {
+          // Non-EEO required select with no answer — report as unknown
+          unknown.push(lbl);
         }
       }
     }